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Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by dammit32, Aug 19, 2002.
how would i tell which case i have...i dont see any labels on the case...do they look different?
on the back of it is a yellow tag that should say what it is, i had to wipe a incha crud off mine to be able to read it. Someboy else can give u more clues if this yellow tag is missing.
In general, the NP205 (gear drive) only came behind manual trannies, and a chain-drive (NP203 or later, 208) came behind autos.
As manuals were dropped ca. 1983, your '91 prolly has the NP208.
Check out Chuck's Drivetrain page for photos and details though, to be sure.
If you are reffering to your '91 K5, and it is still stock, it will have an NP241 transfer case.
There were a lot of 205's that came behind 350 and 400 automatics. There were also 203's that came behind the 465 4-speeds. Chevrolet went from the 208 to the 241 in the K5's in '87 IIRC.
Not all T-cases have a yellow tag on the rear. My '79 205 has a blue tag on the front of the case. A lot of time if it has been into the tag will be missing. Do a search, there is a link here to a transfer case spotters guide somewhere.
SM465's lasted at least until '90 in the "v" series trucks, which would include the K5's and Suburbans our body style. As such, a 1985 K5 would have an SM465/208 combo, and if I'm not mistaken up until at least then, a 1 ton K30 could have a 465/205 combo, and likely even later too.
Odd, I do not see the 465 in the '91 K5/Burb dealer brochure, just see that the 700 was standard due I'm sure to the unbelievable trend to want to put automatics in trucks.
The '91 would have a 241. '88 was the first year for the 241, although I think some SFA trucks still got 208s that model year, and some got 241s.
Me and a buddy test drove an ex-Forestry service 91 K5. SM465 and NP241, so they did last till the last year of K5 production.
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