Re: O/T help with older GM 4X4 transmission

Posted by jdemaris on December 18, 2006 at 09:01:24 from (66.218.11.92):

In Reply to: O/T help with older GM 4X4 transmission posted by perry in mi on December 18, 2006 at 04:54:24:

Without looking at my GM charts - there are a few possible mismatches involved. #1 - the splines on the newer NP208 transfer-case might not match the splines on the 1978 TH350 trans. #2 - if you use the older full-time transfer-case - I wouldn't call coverting it to part-time 4WD easy or cheap. It takes a good amount of work and cost some pretty big-bucks for a good change-over kit. The low-priced kits are awful. Prices range from $100 to over $500 for kits.
You might want to check on the possible spline mismatch. There are custom input shafts made for the transmissions, and also custom outputs for the transfer cases - but all that stuff cost money and is time-cosuming.
For example, up to the middle of 1978 - manual trans. in 4WD had 10 spline outputs and then changed to 32 spline.
Some NP208 transfer cases have 32 spline for use with a TH400 trans, but use 27 spline for use with a TH350 or 700R4.
NP205 came with 27 spline for the TH350 and 32 spline for a TH400 and also 10 spline for a TH400 or a SM465.
I'm not sure exactly sure what the 203 uses for output splines. I have a 78 with the 203 and TH350 trans but it's all original and I have no idea what's inside. I do know that some people are building a sort of dual-transfer case made by joining a 203 to a 208.
Also - is seems to me the 203 is about the least durable or useful as ocmpared to the 205, 208, or 241.

Replies:

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]