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Old 08-31-2006, 09:42 PM
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Hot Rod Cadillac question - T56 (hyd) bellhousing + A833?

Hi guys, got a quick question I'm hoping someone can help me out with to get my hot rod caddie back on the road, but this time with a manual tranny. I can't wait to be bangin gears in this thing...anyway

My caddie is a '93 Fleetwood Brougham, 350 TBI (same as the 88-95 chev trucks), originally a 4l60 trans (not electronic) which is now toast (wouldn't move in any forward gears) and has been removed.

I don't want to put in a $300 junkyard 4l60 that will burn up in 20-30k and I don't have the coin for a rebuild 4l60. Besides which, autos are boring and I hate them.

From work, I managed to score a free GM NP A833, 4 speed OD manual transmission. I want to put this trans in my caddie, but regardless of which manual I choose I think that I'm going to be stuck with a hydraulic clutch setup since there's no provision for a manual Z-bar type clutch setup, and running a jegs/summit hyd. pedal assembly and a single line would just simplify things a lot as far as the clutch goes.

Now, as far as I know, nothing GM that the A833 ever came in came with a hydraulic clutch setup which complicates things a wee bit. What I'm wondering is this - will an A833 bolt into a hydraulic bellhousing from a mid-to-late 90's camaro/corvette/firebird that was equipped with a T56?

If not, are the hydraulic bellhousings from the early-90's GM trucks with the SM465 any different, again would it fit?

If neither will directly bolt up, what is the limiting factor? As far as I can tell the A833 has the same bolt pattern as the muncie & saginaw GM trannies, but needs a bigger opening than a 3-speed saginaw (I have a setup from a '73 nova lying around that I tried to bolt it up to out of curiousity)

Also - is there any difference in the flywheels between the 90's GM trucks that had the 5.7 followed by an SM465 or NV4500, and the GM cars with the T56's? Any recommendation on what donor flywheel I should find to put in the caddie ahead of this A833?

Thanks for the help

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Old 09-01-2006, 11:54 PM
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Well I'm not sure about your specific application. But I'm familiar with hydraulic clutch conversion. I've driven my 83 Z28 for 13 years. After breaking 2 Z-bars with my heavy duty pressure-plate, I yanked it for a hydraulic assembly from an 88 Camaro. It's a complete sealed assembly with reservoir, actuator, lines, and slave-cylinder(all connected permanently for @ $80). To make this work I had to adapt the mount to the fire wall and pedal. And build a (stout)slave-cylinder bracket. The bracket is actually a 3/8 plate that replaces the dust cover, with a brace running forward to the block. It all kind-a wraps around the oil filter. Then, I blew-up my 2nd T5 and trashed it for a T56 (I love my T56!). Anyway, this took some clutch-fork alterations. It seems that in the early 90's Camaros, someone tried to reinvent the wheel and put an inverted pressure-plate in them. I'm running a performance clutch set-up from an 88 Corvette. It took a bit of measuring, hacking, and stainless-welding, But it has worked well for my daily driver.

If I can get it in the air and get some shots this weekend, I'll post them for you. It may not help, but I (with alot of help from dad the machinist) did quite a bit of noggin-scratchin to figure it all out, and wouldn't mind showing it off.
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