I have a 71 jimmy that has been sitting for years. I have finally got to the point were it is ready for the road. All I need is the t case and tranny adapter. Anyone know where to get one. It has the bearing in it and does that come out?
CK5
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TH 350/NP 205 adapter plate
- Thread starter rugged71
- Start date
ezoliver
Mall Crawler
Mine does not have a bearing that I remember....?? A seal on the front and rear. Unless it's different than mine. 
Advanced adapters probably has what you need. Won't be exactly cheap I would look for a used one for sale on Craigslist or ebay...
Advanced adapters probably has what you need. Won't be exactly cheap I would look for a used one for sale on Craigslist or ebay...
they're on ebay all the time...
Are you sure? I believe GM used th350/205 combo for around 10 years in the late 60's early 70's.
The 350/205 adapter came with and without a bearing for the drive sleeve.
I think what he means is that possibly his was a one year only.
I have one for sale for $135, it is the one without the bearing.
I've seen this 350/205 combo used from the late 60's clear up to 1980.
I've also seen both adaptors, too.
I believe the 2-bearing adaptor is the older design.
The 2-seal design is newer but not sure exactly when GM started those.
The more common adaptor is the 2-bearing type.
My biggest question is which of these 2 types of adaptors is the stronger of the two? My guess would be the 2-bearing type since its supporting the coupling sleeve.
Any ideas?
Strength wise that are the same. I like the newer ones because the coupler sleeves are still available. The old bearing ones get grooves worn in them and the trans fluild leaks into the t-case and no new couplers are available.
I think the years for the TH350/NP205 are around 1969-1982. They probably went to the non bearing adapter about 1973.
I think the years for the TH350/NP205 are around 1969-1982. They probably went to the non bearing adapter about 1973.
I'm interested in hearing about them used up to '82 since the K5, 10 and 20 used the 208 case beginning in '81.
1980 was the last year of 205's in the above said rigs. And we all know the K30's carried them up to '91.
Interesting theory about the grooves worn in the older sleeves though.
1980 was the last year of 205's in the above said rigs. And we all know the K30's carried them up to '91.
Interesting theory about the grooves worn in the older sleeves though.
I've got a spare one of those, now you've got me wondering if it will work on my 72 if I ever need it.
The adapter is what bolts the transmission to the t-case and the drive sleeve is housed within the adapter connecting the output of the transmission to the input of the t-case.
I thought '80-82 had the slip yokes and were the last of the Chev 205s except the 1 tons? Maybe it is 1980 as the last year and a few carried over to 1981, all being slip yokes behind the TH350. I have had a couple of these 1980s adapters that have a smaller shifter pivot bolt too.
Alot of the old bearing adapters have cracks. This TH350/205 adapter is the most common Chevy adapter to break.
Didnt Chevy use the NP205 in 1982 with the syncro front output? Anyone know what trans came in front of those models?
The adapters with bearings have the 27/27 spline coupler sleeve, the bearing and a C-clip hold the sleeve in the adapter. The newer adapters also use a 27/27 spline coupler but no bearing to hold it in.
The synchros were around '83 and '84. I've got an '83 sitting in my shop and its synchro'd.
Not quite that simple.
The adaptor that uses 2 seals serves a purpose of retaining the 205's gear oil and the 350's ATF separate from each other.
