Welcome to the Corvette Forums at the Corvette Action Center!

trans. conversion, feasiable?

B

beige81

Guest
I 've always had 4-speed trans., but the recent purchase has a (good) 350 auto.
I'd like to swap but with the computer interface and a rewiring project completed today in my console, I'm pessimistic about the feasiability. anyone have any experience or input on this project for an '81?
regards, Jim
 
Joined
Nov 4, 2000
Messages
946
Location
Scottsville, Kentucky
Corvette
08 Jetstream Blue Z51 coupe
Jim,

Aside from the ECM auto/manual change over, the biggest challenge will be to find the hardware to mount the clutch pedal mechenisim both inside and to the frame. I'm sure it can be done but I would think it might be a good sized project.
 
C

conedude

Guest
you will need help with the welding, if you can't do it yourself. also, to save yourself lots of headaches, make sure the 350 motor if not original, has the hole tapped and threaded on the drivers side for the pivot linkage to mount correctly. if you are planning on tons of horsepower, remember the rear end was not designed for it and may require some attention. most C4s had the dana 44 with the manual transmission.
 
B

beige81

Guest
thanks for the comments,, just wishful thinking on my part...motor and trans are stock original...will likely live w/it. thanks.
 
T

tom81

Guest
Jim,

I’m preparing to convert my 81 from auto to M21. All the parts are available, Art’s has the bracket that bolts to the frame for the Z bar plus a lot of other stuff, Eckler’s also has a lot of parts you will need. All the parts are out there you just have to find them. As far as feasibility goes, if you really want the manual trans in
your vette feasibility of the project is not an issue.

Don’t forget you will also have to replace the U joint caps and bolts on the half shafts and rear end yokes, possibly the drive shaft and maybe the cross-member. I have read that the automatic drive train is not strong enough for the manual trans.

It’s definitely a huge project; I still need the bell housing, cultch, half shafts (replacing) drive shaft? and cross-member? once it all comes together it will be worth it.

If anyone knows whether or not the drive shaft needs to be shortened or lengthened or if the cross-member needs to change or if anything I have stated is incorrect let me know. All the research I’ve done on this project indicates that all these changes are necessary, if not I would like to know.

Tom
 

Rowdy1

Well-known member
Joined
Mar 26, 2001
Messages
1,180
Location
Lake Hopatcong, NJ
Corvette
1962 CORVETTE-SOLD 2004 Z16 Z06 CE
Yes They Are

The trans length is different which means a new or modified driveshaft and crossmember, yoke etc. It will also mean welding, and possibly drilling the frame for the new crossmember. I've done a few of these conversions, but they were some years ago and a whole lot easier with less to contend with. As you said, you will then have to contend with the auto rear, ratio, strength etc. My honest opinion, I'd think VERY seriously about leaving it alone and living with it. It is a MAJOR project, not something I'd consider without a lift, working on jack stands and your back is gonna get to ya. I think I'd sell and buy a standard. Good Luck!
 

Corvette Forums

Not a member of the Corvette Action Center?  Join now!  It's free!

Help support the Corvette Action Center!

Supporting Vendors

Dealers:

MacMulkin Chevrolet - The Second Largest Corvette Dealer in the Country!

Parts/Accessories:

Vetteskins

Advertise with the Corvette Action Center!

Double Your Chances!

Partners

Top Bottom