wasnt someone here making them? whatever happened?

 

the borg rear came stock with 370 gears as a factory option I just sold one out of an 86 T/A, try GM

 

uh no it didnt...

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87 IROC-z 305 TPI 5spd 10-bolt 3.73 posi ,8.8 Accel wires , bosch platinum +4 plugs,MAF sensor screens removed, gutted air box, ram air, K&N air filters,TB coolant bypass ,polyurethane tranny and torque arm mounts, K&N oil filter,Mobil 1 synthetic oil 20w50, futura GLS super sport tires 265/50/15 rear and 235/60/15 front mounted on 86 monte carlo SS rims ,

400 sbc and a 6 spd in the works

 

Oh yes it did. L69 with 5 speed and BW 9 bolt came with 3.70s.

 

really? i didnt know that. i thought it was only 2.77 3.27 and 3.42, hmm you learn something new every day.

 

I'm still working on it. It's taking forever, but it is almost there (I know, I've been saying that for too long now, but it's true). I will have some new series 3 carriers, 4.1 and 3.9 gear sets. If there is enough interest, I will get some more 3.73's.

Miles

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88 427 Camaro
12.18 @ 113mph 1.75 60ft
Currently installing 3.73's into my 9 bolt (YES,it is a 9 bolt & YES they are 3.73's, not 3.70. 4.11's to follow soon )
www.koolmeister.com

 

Actually its 3.45, as 3.42 is the 10-bolt ratio.

And Miles, thank you! I'll probably need a new posi some time down the road. We appreciate your hard work in helping out us 9-bolt owners.


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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

someone inform me when they figure something out to install 3.73 in 9-bolt. I'll jupm in line quickly!

 

Just had a long conversation tonight . I should have some new 4.1 gear sets and new series 3 carriers by the end of the week. Quantities are limited on this first batch (pending verification). When I have the parts in my hands, I will send an email to everyone on the mailing list.

Miles

------------------
88 427 Camaro
12.18 @ 113mph 1.75 60ft
Currently installing 3.73's into my 9 bolt (YES,it is a 9 bolt & YES they are 3.73's, not 3.70. 4.11's to follow soon )
www.koolmeister.com

 

fingers are crossed. my 9 bolt is on its way out right now.

 

LOL, L69s never had 9-bolts. 9-bolts came out when, 1987? The L69 in F-bodies was discontinued at the end of model year 1986. The L69s came with 10-bolt with 3.73s standard. You are just BSing, post where you got your so called "info". And also 3.70 was never OEM optioned from GM, aftermarket companies are the only ones that offered the 3.70 gear set. Much like Miles is doing now with 3.73s, 3.9s and 4.1s.

 

My friend has two '85 trans ams with a 9 bolts.

 

Sorry George, but 9-bolts were first used in 1985 Trans Ams. They werent used in Camaros until 1987. They were discontinued in 89, they switched back to 10-bolts for the 1990 cars.

 

Really? Oh well, I am right on the Camaro subject. I never claimed (nor cared) to be a Firebird expert. Even so, 3.70 (nor 3.73s) were OEM available.

[This message has been edited by MRZ28HO (edited July 29, 2001).]

 

Quote: Really? Oh well, I am right on the Camaro subject. I never claimed (nor cared) to be a Firebird expert. Even
so, 3.70 (nor 3.73s) were OEM available.


Umm, what about the Z28 H.O. motors, many came with 3.73 gears. Ohhh, and then there's the Blazers which usually came with 3.73's.

As for the 9 bolt I'm not sure, but the 10 bolt gears are easy to find.

 

Well, I'm stuck in the middle of my 3.70 gear install. The TPIS sold - Precision Gear so-called 3.73 kit is actually 3.70 (37 ring/ 10 pinion). Comes with a really crappy rear pinion bearing that I gotta replace and without the $22 pinion seal. Got the new races in after a battle and some quality time with my freezer, had the pinion bearing pressed on, and put the pinion in, tightened it up and got greeted with a klicity noise from a bearing that's NFG. Now I gotta find a pinion bearing someplace today.

If my pinion gear on the 3.45's hadn't gone BOOM I'd have much rather taken it back to MI for the Woodward Dream cruise and stopped in at Drive Train Specialists and had them put a set in. I called just for grins and the installed price wasn't much higher than just to buy the parts.

They sell 3.70's, bearings, etc here...
http://www.drivetrainspecialists.com...=29&cat=GM+8.2

What really pisses me off now is that I had my hands on a factory 3.70 back in May at the Rhinebeck swap meet and I thought $275 (last chance on Sunday afternoon price) was a bit too much considering I didn't know how good the posi unit was and that it was missing half the brakes and stuff. Oh well...

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'89 Formula - Thunderchicken - 355 Vette L98/T-56/3.45 9-bolt/black/t-tops - the fun car!
'90 GTA - The GTA - 5.0 LB9/TH700/3.27 9-bolt/black/t-tops/tan leather - the cruiser.

 

Joel, I am talking about 9-bolts only (See my previous post, qouted below). I am well aware that 3.73s were optional in 10-bolts for early Z28s, **** I have two in my driveway with axle codes 6EB and RPO codes GT4.

 

[QUOTE]Originally posted by MRZ28HO:
[B]Really? Oh well, I am right on the Camaro subject. I never claimed (nor cared) to be a Firebird expert. Even so, 3.70 (nor 3.73s) were OEM available.

Unlike yourself I like and know a little about all thirdgens. It's well established that 3.70s were available OEM on 85-86 T/A's. You can check with GM if you wish. Nothing more to say on this topic.