4.88 or 5.12 ring and pinion set
03-14-16, 08:49 PM
#1
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4.88 or 5.12 ring and pinion set
Hello,
Does anyone have a 5.12 or 4.88 ring and pinion set for sale or know of anyone building these now?
Thanks
Tom
Does anyone have a 5.12 or 4.88 ring and pinion set for sale or know of anyone building these now?
Thanks
Tom
03-16-16, 08:17 PM
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I've spoken to Dave Lemon over at Mazdatrix, its a good option but slow turnaround time because they are all custom made. I would still prefer a 5.12 or 4.88.
03-23-16, 05:31 AM
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yes on the ford...i have the ford 7.5 i.r.s and just put gears in it last month. $189 for 456 gears from summit racing,the 8.8 is more popular but the 7.5 only set me back $75 an salvage yard. the 7.5 and the 8.8 use the same ring an pinion gear as the mustang streight axel as well as the ford ranger,thats why there so much cheper!
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03-23-16, 08:27 PM
#8
Old [Sch|F]ool
I wonder if the series 2 RX-8 gearset (4.78) fits in a Turbo II rearend. I know little of RX-8 swappery.
After going to 4.78 and better tires, I'm snapping axles in the splines, so I did an end run around the problem and went to a Ford 9". 8.8 is almost as beefy but you can't get as many good diffs for the 8.8. Or at least not cheaply. NASCAR takeout Lockers are like $200-300 on eBay, spools are cheap too. The 8.8 has... a Ford Motorsport Torsen that you can sometimes find on eBay for $200-300 new if you are patient. If you like Torsens. The Traction-Lok for the 8.8 is a complete turd though.
After going to 4.78 and better tires, I'm snapping axles in the splines, so I did an end run around the problem and went to a Ford 9". 8.8 is almost as beefy but you can't get as many good diffs for the 8.8. Or at least not cheaply. NASCAR takeout Lockers are like $200-300 on eBay, spools are cheap too. The 8.8 has... a Ford Motorsport Torsen that you can sometimes find on eBay for $200-300 new if you are patient. If you like Torsens. The Traction-Lok for the 8.8 is a complete turd though.
03-24-16, 09:44 AM
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The ford IRS seems crazy stout and fairly cheap. Unfortunately it would probably kick me into a much higher class level... I know Mike Van Steinberg at ISC can get the 4.88s but its $$$ and takes 6 months. Spoke with Dave Lemon at Mazdatrix and it a long lead time on his 4.77s also. Guess we won't have them for the 14hours of Daytona coming up.
03-24-16, 12:46 PM
#10
I wonder if the series 2 RX-8 gearset (4.78) fits in a Turbo II rearend. I know little of RX-8 swappery.
After going to 4.78 and better tires, I'm snapping axles in the splines, so I did an end run around the problem and went to a Ford 9". 8.8 is almost as beefy but you can't get as many good diffs for the 8.8. Or at least not cheaply. NASCAR takeout Lockers are like $200-300 on eBay, spools are cheap too. The 8.8 has... a Ford Motorsport Torsen that you can sometimes find on eBay for $200-300 new if you are patient. If you like Torsens. The Traction-Lok for the 8.8 is a complete turd though.
After going to 4.78 and better tires, I'm snapping axles in the splines, so I did an end run around the problem and went to a Ford 9". 8.8 is almost as beefy but you can't get as many good diffs for the 8.8. Or at least not cheaply. NASCAR takeout Lockers are like $200-300 on eBay, spools are cheap too. The 8.8 has... a Ford Motorsport Torsen that you can sometimes find on eBay for $200-300 new if you are patient. If you like Torsens. The Traction-Lok for the 8.8 is a complete turd though.
The 4.88s and 5.12s are similar and need to be made with TII cores to lengthen the pinion...
03-24-16, 12:56 PM
#11
I wonder if the series 2 RX-8 gearset (4.78) fits in a Turbo II rearend. I know little of RX-8 swappery.
After going to 4.78 and better tires, I'm snapping axles in the splines, so I did an end run around the problem and went to a Ford 9". 8.8 is almost as beefy but you can't get as many good diffs for the 8.8. Or at least not cheaply. NASCAR takeout Lockers are like $200-300 on eBay, spools are cheap too. The 8.8 has... a Ford Motorsport Torsen that you can sometimes find on eBay for $200-300 new if you are patient. If you like Torsens. The Traction-Lok for the 8.8 is a complete turd though.
After going to 4.78 and better tires, I'm snapping axles in the splines, so I did an end run around the problem and went to a Ford 9". 8.8 is almost as beefy but you can't get as many good diffs for the 8.8. Or at least not cheaply. NASCAR takeout Lockers are like $200-300 on eBay, spools are cheap too. The 8.8 has... a Ford Motorsport Torsen that you can sometimes find on eBay for $200-300 new if you are patient. If you like Torsens. The Traction-Lok for the 8.8 is a complete turd though.
The 9" is also heavier and less efficient. You can get just as many good diffs for the 8.8, they just are not Nascar or drag race takeout stuff. You can minispool an open 8.8 diff for pretty cheap.
Last edited by LargeOrangeFont; 03-24-16 at 12:59 PM.
03-24-16, 08:58 PM
#12
Old [Sch|F]ool
I see the 9 inch's higher pinion offset as a benefit, not a downside. It allows the rearend to be set higher in the chassis, or in the case of a solid axle it allows more suspension travel. In a 1st-gen the first limiting factor for travel is the driveshaft hitting the floor right under the rear seat/bins crossmember, which is tricky to alter to say the least.
Of course, there are junkyardable 8.8 IRS diffs available. There are 9" based IRS diffs available, either as DIY parts or as prefab assemblies, but for nowhere near as inexpensive as calling up LKQ and giving them a delivery address and a credit card number.
Of course, there are junkyardable 8.8 IRS diffs available. There are 9" based IRS diffs available, either as DIY parts or as prefab assemblies, but for nowhere near as inexpensive as calling up LKQ and giving them a delivery address and a credit card number.
06-29-16, 10:28 PM
#13
Speedsource used to make 4.88 and the same with ISC racing.
Welcome to Rebello Racing and Mazdatrix can do the fabrication for you.
Rebello costs about $350 + shipping them all the gears to do the modification. I may be doing a spare one here in the future. You'll need a Kia 4.77 r&p set and a long pinion for them to modify.
Good luck!
http://www.rebelloracing.com/
His son does the modification.
Welcome to Rebello Racing and Mazdatrix can do the fabrication for you.
Rebello costs about $350 + shipping them all the gears to do the modification. I may be doing a spare one here in the future. You'll need a Kia 4.77 r&p set and a long pinion for them to modify.
Good luck!
http://www.rebelloracing.com/
His son does the modification.
Last edited by Jager; 06-29-16 at 10:29 PM. Reason: Adding link
06-30-16, 07:04 AM
#14
I see the 9 inch's higher pinion offset as a benefit, not a downside. It allows the rearend to be set higher in the chassis, or in the case of a solid axle it allows more suspension travel. In a 1st-gen the first limiting factor for travel is the driveshaft hitting the floor right under the rear seat/bins crossmember, which is tricky to alter to say the least.
Of course, there are junkyardable 8.8 IRS diffs available. There are 9" based IRS diffs available, either as DIY parts or as prefab assemblies, but for nowhere near as inexpensive as calling up LKQ and giving them a delivery address and a credit card number.
Of course, there are junkyardable 8.8 IRS diffs available. There are 9" based IRS diffs available, either as DIY parts or as prefab assemblies, but for nowhere near as inexpensive as calling up LKQ and giving them a delivery address and a credit card number.
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