Hello again, i am again forced to make a decision. I have a 10 bolt shell and a 1985 eaton locker, and a full 10 bolt rebuild kit. Now the axles are 26 spline. I don't have gears, a diff cover( aluminum w/ bearing bolts), or a decent posi( though the eaton may last for ever ,). I have 9 bolt 2.77 now, and besides the posi being tired it has served me well. I have a chance to buy a 1987 3.27 9 bolt discs for $200.00. My questions (is/are) should i get a 90,000 mile 9 bolt with a good reputation and the gear size i am looking for or should i dump twice that much into my 10 bolt. I gotta make my move quickly though. Also the car is a T5, 350. Thnx i await your responses. THE SHAGGY IROC

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'89 SHAGGY IROC
L98, W/C T5, all free stuff,T.E.S.,HOOKER CAT BACK,KYB,ACCEL8.8,JET fan sw. etc. 14.8@ 95.7MPH w/ auto, can't wait for the first T5 run.
so much to do , so little money

 

BTTT

 

The nine bolt is stronger...that is what I have in mine and it and the T-5 have held up.

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Black 89 IROC...355, Solid Crower Cam, TFS heads. 12.0 @ 120.3mph with a 1.9 60ft...all motor

 

up again

 

9 bolts are far superior to 10 bolts, They have a 30% higher torque capacity and they come with bolt in axles from the factory vs. the 10 bolts c-clips. Their downside though is that they cost more for parts and they aren't as numerous in junkyards. Sell the 10 bolt. Trust me!
I'd use the 3.27 9 bolt rearend. When I switched the 2.77 rearend to a 3.27 rearend in my car I immediately noticed the difference. If the 2.77 rearend is an 89 up disc brake rearend. I'd take the brakes off of it and switch them with the ones off of the 87 9 bolt. If your car is an 89 up with rear discs you won't have to change anything on your car (like e-brake cables or prop. valve) just the parts on the rearends which is easy. You could then sell the 2.77 rearend.

 

My 90 formula 350 has 9bolt, 3.27gears ,180,000 miles and going strong.

 

For what it's worth... I tossed my 84 10-both w/ 3.23 and drum brake into the garbage! I got a 86 (or so) 9-bolt w/3.27 posi (sometimes) and disk brakes for $200. I don't worry about it now...

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1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...

-=ICON Motorsports=-

 

go with the 9 bolt ..soon ratios and parts are going to be available in usa ..remember the 9 bolt was hi performance option over the 10 bolt

 

What do you mean, that parts are going to be available for them soon? Is someone trying to import 9 bolt parts?

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1989 IROC-Z Original 350 was swapped for a 305! Why, I'll never know.

 

yes there will be


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'89 SHAGGY IROC
L98, W/C T5, all free stuff,T.E.S.,HOOKER CAT BACK,KYB,ACCEL8.8,JET fan sw. etc. 14.8@ 95.7MPH w/ auto, can't wait for the first T5 run.
so much to do , so little money

 

i also have a 90 but an IROC and i have the 3.27 9 BOLT i love it, but i wish i had a 12 bolt moser, that is the next rear, but my rear is very sturdy, and has taken many beatings and has 110,000 on it
and it will be gettings slicks soon

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Jarrad
1990 IROC-Z L98 350 TPI
TH-700R4
G92- 9 Bolt Borg-Warner 3.27gears
Bright Red Hardtop/ Grey Interior


DAILY DRIVER: 1991 GREY S10 2.5L/5SPD -FOR SALE.