Buick/Pontiac style TH350-will it bolt right up?
07-04-2002, 02:34 AM
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Buick/Pontiac style TH350-will it bolt right up? I know the Chevy style turbo 350's will bolt up to the LS1 (with at least 5 bolts) but what about the Buick/Olds/Pontiac style?
07-04-2002, 03:28 PM
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Re: Buick/Pontiac style TH350-will it bolt right up? not without an adapter plate. the B-O-P bellhousing bolt pattern is different than the Chevy pattern
07-07-2002, 03:36 PM
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Re: Buick/Pontiac style TH350-will it bolt right up? Thanks for the replies. Jegs has an adapter plate for $55. I'll still only be able to use 5 bolts but it's better then paying $250 through Yank.
07-07-2002, 08:20 PM
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Re: Buick/Pontiac style TH350-will it bolt right up? why not just get a chevy patterned 350?
that adapter plate is gonna cause you to run an exotic high dollar converter?
steve frank
that adapter plate is gonna cause you to run an exotic high dollar converter?
steve frank
07-09-2002, 12:45 AM
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Re: Buick/Pontiac style TH350-will it bolt right up? Here are my random thoughts on the subject. I'm no expert and have never really spoken to anyone about this, just going from my theories.
There's a reason for using 6 (or 7) bolts instead of 5. The transmission bellhousing adds structural rigidity to the motor - that's why it's so 'beefy' on the LS1 cars. Likewise, an additional bolt will help the transmission from moving around as much (if it does, I dunno, just thoughts <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> ). If the bellhousing wasn't an integral piece of the motor (like the oil pan), it'd be flimsy or 'old-style' - with the A4 having a dust plate instead of a solid (around the converter) bellhousing. That's one reason I plan on using the plate.
That said. I'm putting a 700R4 behind my LS1 car. I can't think of anyone who has done this - no, it's not the same as a LS1 4L60E because of the bolt pattern on the bellhousing.
The Yank adapter plate is about 5/8" - 3/4" thick.
The LS1 torque converter is about 5/8"-3/4" 'thicker' (including shaft) than a 700R4 converter.
I have yet to see if an LS1 converter will slip on to a 700R4 input shaft, but I think it might.
So, what I'm thinking is that if I use the Yank plate, a standard LS1 converter, and the 700R4 tranny, it'll all bolt to a LS1 flexplate and 'fit' properly.
Of course, I could just be full of hooey.
-Andrew
"hooey-r-us"
There's a reason for using 6 (or 7) bolts instead of 5. The transmission bellhousing adds structural rigidity to the motor - that's why it's so 'beefy' on the LS1 cars. Likewise, an additional bolt will help the transmission from moving around as much (if it does, I dunno, just thoughts <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> ). If the bellhousing wasn't an integral piece of the motor (like the oil pan), it'd be flimsy or 'old-style' - with the A4 having a dust plate instead of a solid (around the converter) bellhousing. That's one reason I plan on using the plate.
That said. I'm putting a 700R4 behind my LS1 car. I can't think of anyone who has done this - no, it's not the same as a LS1 4L60E because of the bolt pattern on the bellhousing.
The Yank adapter plate is about 5/8" - 3/4" thick.
The LS1 torque converter is about 5/8"-3/4" 'thicker' (including shaft) than a 700R4 converter.
I have yet to see if an LS1 converter will slip on to a 700R4 input shaft, but I think it might.
So, what I'm thinking is that if I use the Yank plate, a standard LS1 converter, and the 700R4 tranny, it'll all bolt to a LS1 flexplate and 'fit' properly.
Of course, I could just be full of hooey.
-Andrew
"hooey-r-us"
