I just found something out in the archives. I thought that I had the 27 spline converter, but I have the 30. I thought that that the 30 started in 87.

I think I've read that the reason the 87-93 are better is because the an auxilury valve body.

If I rebuild my '85 can I update it to the newer designs?

I was going to go with a stock rebuild, but if this one can be made stronger I want a performance rebuid. What performance mods do everybody suggest. I'm going to rebuild the 305 and performance mods on it will probably be cam, headers, ported heads. I want to bark in 2 or 3 gears now.

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1989 Pontiac Firebird Formula LO3 Auto
-180 degree stat
-Hooker Cat-Back
velcro t-top bag
*****Possible summer '01 mods*****
Dual Snorkle, Keyless Entry, Wonder Bar from my IROC, 4th gen seats, T/A tail lights

1985 IROC-Z, TPI Auto
-Accel Super Coil


http://www.geocities.com/krt80/

[This message has been edited by Keith5 (edited May 10, 2001).]

 

The 30 spline converter change was in late 84, I think...

Yes you can rebuild an 85 700R4 to 87+ specs. That should be done automatically by any competant trans rebuilder.

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West Coast GM Shootout 2001!
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=-

 

I thought that was completly impossible since the case, valvebody, and most of the hard parts are totally different....

 

When I get a hold of that ATSG book I'll go by it. It's supposed to have updates in the back for each model year.

 

Yes, you can update the 1985. The first thing is to install the Trans-Go Shift kit to correct the shift timing problems that were notorious in 1982-87 units. This kit can be modified too heavy duty specifications easily. Second, the late input & low/reverse sprag assemblies can be put in. Third, do all the updates that you would normally do when building this unit. The only thing that you will not be able to correct is the neutral to drive engagement, which is a little harsher on early units. (no forward accumulator, it acts as a cushion). If you have any questions please call me at 800 7763288 Mon-Sat 11-7 PST and I will do my best too help!!!
Glad Too Help!!!

 

That's my main concern on the tranny, when I put it in drive it jerks really really bad. It also gets hot. I might just try to find a later model one.

 

How about the thick 3-4 clutch steels as in the newest 4L60-E's? Will they fit? I know there are many kits out there to put in more clutches, but from some of the stuff I've been hearing, the thicker steels are the way to go.

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Working on:
'84 Z28 LG4 305 with 200,000 original miles!
Added dual elec fans.
145 MPH IROC Speedo
Building 430 HP 350 (ZZ430)
using primarily GMPP parts.
Short block sitting on a stand. (Man, those Fast-Burn heads sitting on it look good!)

Starting to look like the Kicker poster child!

ASE Certified Master Tech