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| | | | Joined: Dec 2005 Posts: 101 Member | | Member Joined: Dec 2005 Posts: 101 | I just removed my trans to replace it with another one and noticed the bolts holes at the top of the housing are different on both trans's.
One has the housing sort of round with a bolt hole at the very top. The other tran's housing is flat on top with two bolts about 6" to 8" apart.
The old one was suppose to be a TH350, and when I bough the new one I was suppose to be buying a TH350. Help me figure out what I have!
Roger
http://www.flickr.com/photos/45469713@N00/?saved=1
| | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Youv'e got one with the Buick/Olds/Pontiac bolt pattern. The one with the rounded pattern and the hole at the top is the Chevy pattern.
There is also a third variant with a narrow pattern for use with the 60 degree v 6.
Bill Burmeister
| | | | | Joined: Sep 2006 Posts: 1,276 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 1,276 | And still anouther that has both Chevy 90 degree and the BOP patterns in one. I will see if I can find you some pictures of all four and com back and post them for you. | | | | | Joined: Dec 2005 Posts: 101 Member | | Member Joined: Dec 2005 Posts: 101 | Is one favored over the others by truck guys like ourselves.
Roger
http://www.flickr.com/photos/45469713@N00/?saved=1
| | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | The innard are more or less the same, only the bolt pattern is different. The Chevy pattern would be the most likely one to use for the trucks as most have the Chevy engine.
Bill Burmeister
| | | | | Joined: Sep 2006 Posts: 1,276 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 1,276 | | | | | | Joined: Apr 2005 Posts: 2,098 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,098 | Roger,
The favored one is the one that bolts up correctly and has all the other dimensional features including spedo and mounts. One other variant is a 250 transmission - it looks like a 350 but has weaker internal components & was designed for lower HP engines, 6 cyl's, etc - early 80's Olds Cutlass comes to mind. Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
| | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | There's also the 375, it was used in some Buick application as I recall. It has a longer tailshaft.
There's also a truck 375, basically a short tailshaft 400. It was use in 4x4 trucks with tha NP203 full time t-case. My parents used to have a '76 Blazer that was equipped with that trans/t-case combo (Dad special ordered it that way).
Bill Burmeister
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