Slim Jim Transmission
#1
Slim Jim Transmission
Got a 1963 Starfire with slim Jim Trans. It is getting weak, and no one here wants to touch it. Looked into a newer trans. upgrade, but it requires too much cutting and fab work. Looking for any suggestions, Thanks
#3
#9
#11
not familiar with a 63 starfire.. from what I remember about a slimjim, they are smaller around than most auto trans,.so the trans tunnel may need to be altered (Maybe not, because in 64 they changed from slimjim to 400 trans) only thing I'm" SURE of", A 700R IS A BETTER TRANS ! AND WILL WORK WELL IN A HEAVY CAR.
Last edited by Fonz; December 27th, 2023 at 08:49 PM.
#12
I've mentioned it before on our site, the Slim Jim Rotohydramatic is NOT a good transmission. Unless you're doing a concours restoration on your Starfire, you should make plans to replace it. The TH400 is bulletproof. Probably can't go wrong with a 700R4 or 2004R either since you're having the case modified anyways.
#14
If you haven't already, you might inquire with these guys. They might be able to give you some ideas with regard to sorting out your Slim Jim:
www.fatsco.net
#16
Here's another thread on a Slim Jim conversion. Apparently the user in the thread Charlie posted; ripper27, finally got his Ross Racing conversion done.
https://classicoldsmobile.com/forums...ebuild-156406/
https://classicoldsmobile.com/forums...ebuild-156406/
#17
not familiar with a 63 starfire.. from what I remember about a slimjim, they are smaller around than most auto trans,.so the trans tunnel may need to be altered (Maybe not, because in 64 they changed from slimjim to 400 trans) only thing I'm" SURE of", IT'S A BETTER TRANS ! AND WILL WORK WELL IN A HEAVY CAR.
#20
I think the user in the threads that Charlie and I posted; ripper27, actually used a TH350 in his Ross Racing conversion. It fit better than a TH400 and is still a much better transmission than the Slim Jim Rotohydramatic.
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gmacolton
Transmission
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April 29th, 2010 12:53 PM