Iroc 10 bolt

[qwik86iroc]

Anyone know how I managed to break my 3.73 Richmond Pinion Gear, and not the ring gear? It's an 86 rearend and the gear was about 2.5 years old. Also does anyone know what the max camshaft would be for an 86 TPI ECM?

[I-ROC KID]

hey how much did that rear end cost u im look to get a 3.73 posi since urs broke think i shoudl get a 12 bolt i have an 85 I-ROC

[qwik86iroc]

Originally Posted by I-ROC KID

hey how much did that rear end cost u im look to get a 3.73 posi since urs broke think i shoudl get a 12 bolt i have an 85 I-ROC

Curry makes a stronger bolt in rear end for these cars and it's about $2700. But Richmond makes a gear you can buy with a seperate shim kit which is only $300 total in parts. Then it has to be set up. CORRECTLY. Mine lasted 2.5-3 years with daily abuse, I thought the ring gear would break though. The Rear end and the gear both can be purchased from Summit.

[I-ROC KID]

so its either get some really good for lots of $$ or get some ok for a lot cheaper

[qwik86iroc]

Originally Posted by I-ROC KID

so its either get some really good for lots of $$ or get some ok for a lot cheaper

Exactly It really depends on the horsepower you intend to have or have now. I believe mine was broken when we were testing a supercharger on my car. Mines a 350 with a Holley Stealth ram 24lb injectors,58mm Throttle body MSD and so on.....

[I-ROC KID]

ok thanks for the prices oo by the way thats probly american prices eh because im from canada so it will be a littel different but not much anyways i got a 355 and i plan to do a couple mods but not to much to it maybe heads headers something along those lines ill probly just got with the 300 buck one
thanks

[Dober89]

10 bolts can handle a bit of power if you do some work to them. When you get lots of torque and traction though they do tend to die. If I ever break my 9 bolt im replacing it with an 8.8" rearend!

[I-ROC KID]

8.8" out of a mustang, what would u get it out of year wise and how would u put one in is it hard would i need to take off the bracets and weld mine on and what price we talking about here for an 8.8"

[qwik86iroc]

Originally Posted by FAGulaLT1

*comment removed by moderator*

Stay away from my rearend.

[Dober89]

Theres a guy here in ontario that takes fbody rearends and cuts off the axle tubes. Then gets an 8.8 and cuts off the tubes and welds the gm tubes onto it. That way it bolts right in no problem. Its a strong as hell rearend and quieter and uses up less power than the 12 bolt and the 9".

[DaMoNe6969]

Originally Posted by FAGulaLT1

just go to johns house, he'll give you some head

yeah but is he any good?!

[I-ROC KID]

how much would it cost to do that 8.8 rearend and do u think i could do it myself with mechanic experience

[Dober89]

It would depend on what kind of internals you want in the rearend i guess. And if you give him a core unit. I think he uses new axles and posi units from strange or someone big.

Installing a rearend isnt too hard with some help from a friend. I think brakes would be the hardest part.

[89IROC&RS]

a proporly built 10 bolt will handle up to 450hp depending on the parts you use and will cost a helluva lot less than a 12 bolt rear.

Traxon rear carrier, with 3.73 gears, 28 spline axles, and a rear diff girdle/cover will do ya just fine.

as to how you broke the pinion gear, pretty simple, something wasnt right, and over time it killed it, how exacty did it break?? if you just lost some teeth, then it just wasnt lined up right and in the process of binding it ate up some teeth, if its something more serious, id say something else went very wrong.

[qwik86iroc]

Originally Posted by 89IROC&RS

a proporly built 10 bolt will handle up to 450hp depending on the parts you use and will cost a helluva lot less than a 12 bolt rear.

Traxon rear carrier, with 3.73 gears, 28 spline axles, and a rear diff girdle/cover will do ya just fine.

as to how you broke the pinion gear, pretty simple, something wasnt right, and over time it killed it, how exacty did it break?? if you just lost some teeth, then it just wasnt lined up right and in the process of binding it ate up some teeth, if its something more serious, id say something else went very wrong.

There were silver dollar size pieces of it lying in the bottom of the housing. The car always had a strange vibration to it at high speeds. We thought it was a bent driveshaft but it wasn't. I also have a Urethayne tranny mount which we thought was allowing more vibration to pass through than normal. Hopefully the next guy sets it up properly.