Info
Cadillac CTSV 8.8 Swap info:
Most 8.8s considered for this swap have the same cover, so pick the one you want.
You can get an Iron or Aluminum differential case.
99 Cobra's have a 28 Spline carrier. 01,03-04 had 31
The factory carrier that comes in the T-Birds and Mark 8's is a 28 spline unit.
You want a 31 spline for the true Trac.
The 8.8s IRS are found in the following vehicles:
1989-1997 Thunderbird Supercoupe (SC)(All Posi)
1992-1997 Thunderbird V-8 models with rear disc brakes(some posi)
1992-1997 Lincoln Mark VIII (All al carrier, most non-posi-traction)
1989-1992 Mercury Cougar XR7, supercharged V-6 (All posi)
1993-1997 MC V-8 with rear disc brakes(some posi), after 94 all Cougs were XR7’s
Cover Bolts: 10
Ring gear diameter: 8.8”
Pinion shaft diameter/splines: 1.625/28
Axle shaft diameter/splines: 1.29/28 or 1.32/31
Available ratios: 2.26, 2.47, 2.73, 3.08, 3.27, 3.45, 3.55, 3.73, 3.90, 4.10, 4.30, 4.56, 4.88, 5.13, 5.71, 6.14
F150's, explorers, expeditions, and etc have 31 spline carriers. some are posi some are not. Check the tags on the housings
Gear Ratios:
3.08
3.27
3.31
3.55
3.73
4.11
4.30
4.56
4.88
5.13
5.71
With the CS kit, you do NOT need to modify exhaust on stock exhaust. Magnaflow and B&B need to be dimpled on one side.
Quiet Gears = Ford Racing A-4209-88373 or M-4209-88373 (3.73s)
Best diff = Ford Racing A-4204-F318 with carbon fiber clutch plates
To determine the gear ratio, and whether or not the unit has posi-traction, look at the tag that is attached to one of the differential cover bolts.
The first 4 spaces signify the gear ratio and whether or not it has posi-traction.
If the unit has posi-traction, then the second space will have an L in it representing (limited slip), the remaining spaces specify the gear ratio.
For example, 2 L 7 3 means posi-traction with a 2.73:1 gear ratio. Most people pay a salvage yard between $300-$400 for the donor parts.
Creative Steel 8.8 Diff Swap Fastener List:
Driveline adapter to transmission yoke -
• 3- 12mm x 35mm(1 3/8") socket-head cap screws (allen wrench)
• 3- 12mm all metal lock nuts
Driveline to adapter -
• 4- 10mm x 25mm(1") socket-head cap screws(allen wrench)
• 4- 10mm lock washers
Carrier bearing to carrier bearing bracket-
• 2- 8mm x 15mm(1/2") hex head bolts (may already be installed)
• 2- 8mm lock washers (may already be installed)
(Use original bolts to bolt carrier bearing bracket to car)
Driveline to differential yoke-
• 4- 12mm x 25mm(1") 12-point bolts
Differential to sub-frame-
• 2- 14mm nuts
• 2- 14mm lock washers
(Use original bolts in all three mounting locations. use the two supplied 14mm nuts on the bolts that go through the rear differential bracket)
Torque specs-
8mm- 15-20 ft lbs 10mm- 40-45 ft lbs 12mm- hex 55-60 ft lbs 14mm- 65-70 ft
lbs
12mm- cap screw 60-65 ft lbs
** Use supplied Loctite on all fasteners for added safety**
13. Install Videos are nice:
Cadillac CTS-V 8.8 Differential Swap from Creative Steel - YouTube
14. DIYrs will need the Diff front mounting bushings.
15. Some Eaton True-Trac carriers "clunk" straight out of the box.
16. mpsautosalvage on Ebay seems to be a popular place to buy used diffs.
17. Prothane front poly bushings: http://www.summitracing.com/parts/PTP-6-1609/
18. Modifying the rear cover: https://ls1tech.com/forums/cadillac-...ver-8-8-a.html
19. Diff breather vent at summit part # SUM-E730311
20. Front Bushing size, with picture: https://ls1tech.com/forums/cadillac-...ings-diff.html
21. When removing stock CVs, pull back the boot and remove the Snap Ring with a pair of Snap Ring pliers. The CV will slide off now. No Vise or hammer needed.
22. It is advisable to drill and tap a hole at the lowest point in the diff housing to aid in draining.
23. Aluminum front bushings: http://www.fortesparts.com/product_i...oducts_id=2984
24. 8.8 Gear swap with photos: http://www.kitcarinfo.com/IRS_Gear_Swap.htm
LINKs:
Used R&P from Randy's
http://www.ringpinion.com/b2c/PartsL...D=310&CatID=35
Rebuild
http://www.kitcarinfo.com/IRS_Gear_Swap.htm
For those interested in building their own diff, here is a 'DIY' for rebuilding the 8.8.
http://forums.bimmerforums.com/forum...0#post26742370
Gear Ratios
http://www.fordification.com/tech/rearends_ford13.htm
New Housings:
http://www.fordracingpartsdirect.com.../m-4010-g3.htm
http://www.race-mart.com/Ford_Motors...-4010-A88.html
Homemade 8.8 Case spreader:
http://www.svtperformance.com/forums...g-fixture.html
If you are using OEM Ford gears, be aware they are now made by Face Hobbing so adjusting the pattern is a little bit different than the older gears or aftermarket gears. These are what I used for reference when adjusting the pattern
http://www2.dana.com/pdf/5717.pdf
http://departments.weber.edu/automot...rpretation.pdf
Finally, I highly recommend going with a solid pinion spacer in place of the crush collar. I went with the kit made by Yukon. Ratech also makes one.
http://www.ratechmfg.com/fordspbs.htm
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25. Driveshaft shop quote on the CS kit......
Quote:
Originally Posted by Driveshaft Shop
OK, the stock shaft would be 62 face to face, this uses a 1.5" plate in the front and a .800 thick plate in the rear (CV's both ends) the Creative 8.8 kit is 63-1/16 face to face or 1-1/16 different. so what we can do is this. with out the rear plate the shaft would be 61.200 long. so the rear plate would have to be 1.8625 long to bolt up to the Ford Diff, as it is we make one for the 6Cly Mustang's that has the same patterns we would need on both end. but its only 1.5" thick . all we would have to do is make the plate thicker. yes this would be able to be done easy. the plate would run about 150.00
so if you want to buy a shaft now and then change to the 8.8 later this is all that would be needed to make the change.
26. OEM Vent: http://www.breezeautomotive.com/deta...=478&cat_id=13
Quote Originally Posted by 54inches
View Post:
https://www.ctsvowners.com/threads/diy-ford-8-8-into-v1-build-thread.8999/?u=947