Rear end options?
#1
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Hello, so my lumped S2 kitty is pretty happy with her 3.54 open diff, but I think she'd be even happier with a 3.31 final drive and LSD.
Could the community suggest the best way to get there?
I've searched for 3.31 Powr-lok rear ends but it's near impossible to find anything, let alone in decent shape. Plus I feel bad getting rid of a very clean and perfectly good diff.
I've considered getting Dana 44 3.31 gears and a spline adapter kit but not sure what LSD would be compatible with that set up and the cost is not ideal.
Are there other options that I'm missing? Does anyone know if a rear end out of a later Jag, say an XJS would be a direct fit?
Thanks y'all.
Could the community suggest the best way to get there?
I've searched for 3.31 Powr-lok rear ends but it's near impossible to find anything, let alone in decent shape. Plus I feel bad getting rid of a very clean and perfectly good diff.
I've considered getting Dana 44 3.31 gears and a spline adapter kit but not sure what LSD would be compatible with that set up and the cost is not ideal.
Are there other options that I'm missing? Does anyone know if a rear end out of a later Jag, say an XJS would be a direct fit?
Thanks y'all.
#2
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Just IMO but 3.54 to 3.31 isn't that much change. Will it be worth the effort?
Anyhow, 3.31s are hard to find, yes. I was lucky to find a 3.31 LSD a long time ago. Took a lot of looking. Most have been scooped-up many years ago. It was standard issue on USA V12s in the 70s.
Later came the 2.88 and, in the 90s, the 3.54
A few early 80s cars had a 3.07 ...with LSD if behind a V12
Others here will chime in on using the Dana gears. I can't remember the details but it's doable
Cheers
DD
Anyhow, 3.31s are hard to find, yes. I was lucky to find a 3.31 LSD a long time ago. Took a lot of looking. Most have been scooped-up many years ago. It was standard issue on USA V12s in the 70s.
Later came the 2.88 and, in the 90s, the 3.54
A few early 80s cars had a 3.07 ...with LSD if behind a V12
Others here will chime in on using the Dana gears. I can't remember the details but it's doable
Cheers
DD
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#4
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Just IMO but 3.54 to 3.31 isn't that much change. Will it be worth the effort?
Anyhow, 3.31s are hard to find, yes. I was lucky to find a 3.31 LSD a long time ago. Took a lot of looking. Most have been scooped-up many years ago. It was standard issue on USA V12s in the 70s.
Later came the 2.88 and, in the 90s, the 3.54
A few early 80s cars had a 3.07 ...with LSD if behind a V12
Others here will chime in on using the Dana gears. I can't remember the details but it's doable
Cheers
DD
Anyhow, 3.31s are hard to find, yes. I was lucky to find a 3.31 LSD a long time ago. Took a lot of looking. Most have been scooped-up many years ago. It was standard issue on USA V12s in the 70s.
Later came the 2.88 and, in the 90s, the 3.54
A few early 80s cars had a 3.07 ...with LSD if behind a V12
Others here will chime in on using the Dana gears. I can't remember the details but it's doable
Cheers
DD
#5
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Putting a 3:73 r&p in mine as we speak. Setup is giving me fits and almost to the conclusion it's the new Motive gear set. But if you have an overdrive trans and looking for fun I would go with a 3:73, save yourself the learning curve (it's deep) and get an aftermarket lsd.
Last edited by slofut; 09-01-2024 at 09:39 AM.
#7
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Putting a 3:73 r&p in mine as we speak. Setup is giving me fits and almost to the conclusion it's the new Motive gear set. But if you have an overdrive trans and looking for fun I would go with a 3:73, save yourself the learning curve (it's deep) and get an aftermarket lsd.
I chose 3.07's because most of my driving is on the highway. I have enough engine to be respectable and if I need to be respectable quicker, 3rd gear will take me past 100mph which is way faster than Troopers will let you get away with. At 70 in 4th the engine is at 2000rpm and getting 17-19mpg.
Dave
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#8
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I put a Motive 3.07 with Auburn Gear locker in mine last winter. Setup pattern and clearances are good, but still whines. Improved a little after awhile, but definitely not quiet. I plan to replace the Motive's with something else this winter.
I chose 3.07's because most of my driving is on the highway. I have enough engine to be respectable and if I need to be respectable quicker, 3rd gear will take me past 100mph which is way faster than Troopers will let you get away with. At 70 in 4th the engine is at 2000rpm and getting 17-19mpg.
Dave
I chose 3.07's because most of my driving is on the highway. I have enough engine to be respectable and if I need to be respectable quicker, 3rd gear will take me past 100mph which is way faster than Troopers will let you get away with. At 70 in 4th the engine is at 2000rpm and getting 17-19mpg.
Dave
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#9
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Thanks for that info Dave, I have a feeling I'm not going to be happy with this Motive gear, I can't get pattern off the toe when setting backlash. Pinion depth comes in marginal too but prob ok but after getting backlash it's a no go anyway. $250 wasted, I've made about 25 pattern pic folders, the last 12 or so were starting over from scratch and with way too much pinion and then backing off a little at the time to try to sneak up on it
Left BL alone exe for enough clearance to rotate, looked good right up until I set backlash. I'm past done with it... Motive is the only gear I know of that's dual drilled for both ring gear bolt sizes.
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Anyway, the Auburn carrier I'm using (- Summit $426 AUBURN grip-n-lock Carrier AUB-546085 19 spline) dropped right in and you can use any aftermarket Dana 44 R/P you want. It will take different carrier bearings, but they're common items.- Bearings and Races
Carrier Bearings: 25590
Carrier Races: 25523
Pinion Bearing Inner: 31594
Pinion Race Inner: 31520
Pinion Bearing Outer: M88040
Pinion Race Outer: M88010
Spicer 26 spline pinion yoke 2-4-8091X
Input seal is CR 15788 (in Motive shim kit)
Good luck and remember, setting up a differential is like "....a box of chocolates, you never know what you'll get...." until it's back on the road.
Dave
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#10
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I've already refurbed my power lok carrier and am pretty happy with it so after spending nearly $300 on parts for it
(part of that learning curve I was talking about) I'll be hard pressed to change that. But I'll be on the hook for another, better quality r&p. I wish I'd bought that Auburn lsd.
BTW... Big Blue, I put a 3:54 in my 71 corvette with an ls1 and T56 and it's a blast, 5th and 6th gear are both overdrives on that trans and with the 3:54 I almost never use 6th.
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BTW... Big Blue, I put a 3:54 in my 71 corvette with an ls1 and T56 and it's a blast, 5th and 6th gear are both overdrives on that trans and with the 3:54 I almost never use 6th.
Last edited by slofut; 09-01-2024 at 08:57 PM.
#11
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#12
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I've rebuilt the standard Sailsbury on my XJS and the key is getting the pinion depth correct first. If that's not correct, then either the side play or the backlash will be incorrect, you won't be able to get both correct. I had to take my time, but I was able to get everything correct in the end and the diff is quiet.
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#13
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Dave
#14
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I've rebuilt the standard Sailsbury on my XJS and the key is getting the pinion depth correct first. If that's not correct, then either the side play or the backlash will be incorrect, you won't be able to get both correct. I had to take my time, but I was able to get everything correct in the end and the diff is quiet.
Dave
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After much research, I think you are spot-on. The Motive gear set I bought did not have a depth setting stamped on the face of the pinion and I didn't have anything to go on. A verbal over the phone from Motive was "...usually x.xxx is a good starting point for the depth and then go from there" and Dana info I could find also gave a generic starting number. I used the original shim pack from the Salisbury pinion as my starting point. When I pull the differential this winter, for the third time, I will know more than I did last winter, so that's a plus.
Dave
Dave
#17
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LS3 and 6L80e, currently with 3.54 open diff.
As mentioned, it's not unhappy but at around 85mph it starts wining a bit and I generally expect the tranny to react to downshifts faster. I'm thinking both issues can be rectified with a slightly taller final drive that's closer to what the 6L80 expects since it was programmed for a 3.27 rear end in the donor Camaro SS.
As mentioned, it's not unhappy but at around 85mph it starts wining a bit and I generally expect the tranny to react to downshifts faster. I'm thinking both issues can be rectified with a slightly taller final drive that's closer to what the 6L80 expects since it was programmed for a 3.27 rear end in the donor Camaro SS.
#18
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LS3 and 6L80e, currently with 3.54 open diff.
As mentioned, it's not unhappy but at around 85mph it starts wining a bit and I generally expect the tranny to react to downshifts faster. I'm thinking both issues can be rectified with a slightly taller final drive that's closer to what the 6L80 expects since it was programmed for a 3.27 rear end in the donor Camaro SS.
As mentioned, it's not unhappy but at around 85mph it starts wining a bit and I generally expect the tranny to react to downshifts faster. I'm thinking both issues can be rectified with a slightly taller final drive that's closer to what the 6L80 expects since it was programmed for a 3.27 rear end in the donor Camaro SS.
Bill
#19
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Is the rear diff whining at 85mph or are you saying the motor is spinning up a bit fast? I'm on the fence between a T56 and a 6L80e on my car (just for time). Looks like the T56 has much taller 5th and 6th gear overdrives compared to the camaro 6l80e so with the 3:73 I may need to stay with my original plan using the t56. I see now why you may want a slightly taller gear, I sort of took it for granted the overdrive auto boxes would have similar top ratios.
Bill
Bill
You absolutely cannot go wrong with a t56. Would be an absolute blast and maybe something I'd do with another swap.
#20
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LS3 and 6L80e, currently with 3.54 open diff.
As mentioned, it's not unhappy but at around 85mph it starts wining a bit and I generally expect the tranny to react to downshifts faster. I'm thinking both issues can be rectified with a slightly taller final drive that's closer to what the 6L80 expects since it was programmed for a 3.27 rear end in the donor Camaro SS.
As mentioned, it's not unhappy but at around 85mph it starts wining a bit and I generally expect the tranny to react to downshifts faster. I'm thinking both issues can be rectified with a slightly taller final drive that's closer to what the 6L80 expects since it was programmed for a 3.27 rear end in the donor Camaro SS.
Dave
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