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Thread: stock rear diff
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Slinky
Revvin Up
Posts: 56
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posted March 04, 2013 01:54 AM |
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stock rear diff
my 74 rear diff has the factory 4.625 assembly. I'm wondering how much power people have put through these before having part failure. i know the stock fb gsl diff's hold up to around 370 if you're not launching hard.
any help would be great. trying to figure out my build and needing minor details like this
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74 Mazda Repu-20/22r toyota hybrid swap (working on 302/T5 swap)
83 Mazda rx7-302 swap,t-56, N2o
82 Mazda rx7-460 swap, 4 speed, working on boost
78 Ford F-250 4x4-420 hp 400M, C6, 7" lift
83 Toyota Celica GTS-gutted (future 20/22 home)
86 Ford Ranger 4x4-1/2 ton axle's, 63"leafs, vw TDI swap
53 GMC 1/2 ton Pickup-Vortec 5.3 swap, T350, 9"
83 VW Cabriolet-16vaba-T swap
95 VW Golf-Harlequin Project
81 Chevy El Camino-Gutted (5.3 vortec victim)
Facebook.com/NWMetalWerks
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Brad
Rotorhead
Posts: 1672
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posted March 04, 2013 11:23 AM |
 Edited By: Brad on 4 Mar 2013 11:23 |
I've never heard of a ring and pinion break on REPU. Or the open diff. It's a solid truck rear.
One truck here has ~ 450hp and 450 torque to the ground and the rear never broke. Transmission on the other hand did.
early Rx7 is small in comparison.
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Slinky
Revvin Up
Posts: 56
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posted March 04, 2013 02:16 PM |
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quote:
I've never heard of a ring and pinion break on REPU. Or the open diff. It's a solid truck rear.
One truck here has ~ 450hp and 450 torque to the ground and the rear never broke. Transmission on the other hand did.
early Rx7 is small in comparison.
exactly what i needed to find out, thanks brad. did a lot of research the last few days and couldn't find much of any read diff reviews.
____________
74 Mazda Repu-20/22r toyota hybrid swap (working on 302/T5 swap)
83 Mazda rx7-302 swap,t-56, N2o
82 Mazda rx7-460 swap, 4 speed, working on boost
78 Ford F-250 4x4-420 hp 400M, C6, 7" lift
83 Toyota Celica GTS-gutted (future 20/22 home)
86 Ford Ranger 4x4-1/2 ton axle's, 63"leafs, vw TDI swap
53 GMC 1/2 ton Pickup-Vortec 5.3 swap, T350, 9"
83 VW Cabriolet-16vaba-T swap
95 VW Golf-Harlequin Project
81 Chevy El Camino-Gutted (5.3 vortec victim)
Facebook.com/NWMetalWerks
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Brad
Rotorhead
Posts: 1672
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posted March 04, 2013 06:49 PM |
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No prob dude.
You can also get a kit here to install a Torsen/Gleaasen Limited slip, they really put the power down. Great for street, autocross or road racing. Not for drag racing though. Or off road. Not sure what your plans are for the truck but you can also put a 2nd gen turbo 2 LSD in there, I believe its clutch plate. Better for drags.
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Slinky
Revvin Up
Posts: 56
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posted March 05, 2013 05:52 AM |
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quote:
No prob dude.
You can also get a kit here to install a Torsen/Gleaasen Limited slip, they really put the power down. Great for street, autocross or road racing. Not for drag racing though. Or off road. Not sure what your plans are for the truck but you can also put a 2nd gen turbo 2 LSD in there, I believe its clutch plate. Better for drags.
i was actually thinking of adding a clutch style lsd of some sort in the next month. you just saved me some research good sir :)
I'm really just using this truck for a daily driver/hauling fab equipment on the weekends. adding a little fun factor here and there. I own a fabrication shop, so the repu is the "shop truck" of sorts.
we will be doing a little 1/8 miles drag racing this summer with it since my rx7 won't be up and running for another year...
Working on a different motor swap right now. Don't get to excited though, it won't be a rotary. thought about slapping my 12a in but i just cant justify it.
____________
74 Mazda Repu-20/22r toyota hybrid swap (working on 302/T5 swap)
83 Mazda rx7-302 swap,t-56, N2o
82 Mazda rx7-460 swap, 4 speed, working on boost
78 Ford F-250 4x4-420 hp 400M, C6, 7" lift
83 Toyota Celica GTS-gutted (future 20/22 home)
86 Ford Ranger 4x4-1/2 ton axle's, 63"leafs, vw TDI swap
53 GMC 1/2 ton Pickup-Vortec 5.3 swap, T350, 9"
83 VW Cabriolet-16vaba-T swap
95 VW Golf-Harlequin Project
81 Chevy El Camino-Gutted (5.3 vortec victim)
Facebook.com/NWMetalWerks
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Crit
Revvin Up
Finally REPUing
Posts: 90
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posted March 05, 2013 06:14 AM |
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For what it's worth, an S4 RX7 big-ring clutch-type LSD won't fit in a REPU axle. The axles shafts normally bottom against the spider gears in the open diff, but the guts of the clutch LSD are much wider. You'd need to cut off some of the splined end, space the outer bearings out, or do something else funky to run a Mazda clutch-type LSD.
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Slinky
Revvin Up
Posts: 56
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posted March 05, 2013 01:43 PM |
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quote:
For what it's worth, an S4 RX7 big-ring clutch-type LSD won't fit in a REPU axle. The axles shafts normally bottom against the spider gears in the open diff, but the guts of the clutch LSD are much wider. You'd need to cut off some of the splined end, space the outer bearings out, or do something else funky to run a Mazda clutch-type LSD.
dude you're killin me here, you can't shoot an idea down without posting a solution!
and honestly, that really isn't that much modification to get it working...chop blades where made for a reason ;)
____________
74 Mazda Repu-20/22r toyota hybrid swap (working on 302/T5 swap)
83 Mazda rx7-302 swap,t-56, N2o
82 Mazda rx7-460 swap, 4 speed, working on boost
78 Ford F-250 4x4-420 hp 400M, C6, 7" lift
83 Toyota Celica GTS-gutted (future 20/22 home)
86 Ford Ranger 4x4-1/2 ton axle's, 63"leafs, vw TDI swap
53 GMC 1/2 ton Pickup-Vortec 5.3 swap, T350, 9"
83 VW Cabriolet-16vaba-T swap
95 VW Golf-Harlequin Project
81 Chevy El Camino-Gutted (5.3 vortec victim)
Facebook.com/NWMetalWerks
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Brad
Rotorhead
Posts: 1672
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posted March 05, 2013 04:08 PM |
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quote:
For what it's worth, an S4 RX7 big-ring clutch-type LSD won't fit in a REPU axle. The axles shafts normally bottom against the spider gears in the open diff, but the guts of the clutch LSD are much wider. You'd need to cut off some of the splined end, space the outer bearings out, or do something else funky to run a Mazda clutch-type LSD.
The axles bottom against the thrust block in an open diff. I'd have to see a pictures of the S4 diff to understand that.
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papsmagu
Revvin Up
Posts: 96
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posted March 19, 2013 04:54 AM |
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You can always go with a ford 8.8....they are at every junk yard and they come with disk brakes in the rear. i bought mine for $150. If you get the right year they are LSD. they fit with some minor modification. i shortened mine 1" on each side so i could run 10" rear wheels. but if i rememver correctly all you have to do to make one fit is modify the location of the leaf spring brackets and parking brake cable. other than that its pretty straight forward.
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crit
Revvin Up
Finally REPUing
Posts: 90
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posted March 24, 2013 10:50 PM |
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quote:
quote:
For what it's worth, an S4 RX7 big-ring clutch-type LSD won't fit in a REPU axle. The axles shafts normally bottom against the spider gears in the open diff, but the guts of the clutch LSD are much wider. You'd need to cut off some of the splined end, space the outer bearings out, or do something else funky to run a Mazda clutch-type LSD.
dude you're killin me here, you can't shoot an idea down without posting a solution!
and honestly, that really isn't that much modification to get it working...chop blades where made for a reason ;)
Brad already gave you the solution. The S4 clutch type rear does not have the same spider gear setup as the stock rear end. You can't support the axles. The FD / RX-8 diff solution works with the addition of the ring gear spacer and axle-spline-support parts available on here. The problem is that the REPU axle uses tapered roller bearings at the outers vs. ball bearings. The axles need some structure on the inside of the diff carrier that they can bear against in order to be supported on the bearings. The guts of the S4 diff don't provide for this. There are even more details related to the ring gear hole sizes and machining to the S4 carrier that make it an even bigger mess. A chop saw won't fix any of this.
I wanted the S4 setup to work and took it to a very well-respected man in Atlanta who was building SCCA-winning cars before I was born to set it up. It's just not possible. If it weren't for the availability and relative ease of the FD Torsen unit, I'd have gone to a complete Toyota rear axle that allows for lots of gear ratios and lockers available.
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