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1st - 5th Gen Drivetrain Transmissions, clutches, and axles.

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Old 08-11-2012, 10:29 PM   #1 (permalink)
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'78 305 coupe, tranny?

Anybody know what was standard for this layout as far as auto trannies go? I'm hoping and praying it isn't a 200.

In the depressing event that it is, will a 200 stand up in front of a base 290 hp goodwrench 350?

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Old 08-12-2012, 01:12 PM   #2 (permalink)
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Most likely the TH200. And no it won't hold up to that much hp. Now find a TH200R4 or TH700R4 or last choice TH350. The R4's would give you OD and save a bit on fuel. Plus you can beef them up to handle more HP as needed.

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1977 Chevrolet Impala Sedan, 305, TH200, 2.56:1, 106K miles, 37 Lifetime Warranty Parts.
1989 GMC C1500 Sierra ECSB 350, HM290, 3.08:1, 329K miles, 6 Lifetime Warranty Parts.

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Old 08-13-2012, 11:22 AM   #3 (permalink)
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Probably need to check to be sure, but I think the TH350 may have only come on the 350 engines. A 700R4 would be a big upgrade.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
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95 9C1 3.08 posi
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Old 08-13-2012, 01:01 PM   #4 (permalink)
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Nick he has a 305 in it right now. He will be installing a 350 into it.

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1977 Chevrolet Impala Sedan, 305, TH200, 2.56:1, 106K miles, 37 Lifetime Warranty Parts.
1989 GMC C1500 Sierra ECSB 350, HM290, 3.08:1, 329K miles, 6 Lifetime Warranty Parts.

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Old 08-13-2012, 04:49 PM   #5 (permalink)
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I know, I was just figuring that he probably has the 200 in it because it came with the 305. I don't know how well it will handle a 350, especially a modern crate motor with a LOT more than the 170hp the 350 came with in 78. Gotta figure, if it wasn't enough to handle that, then 290 is probably way too much. I think a 700R4 would suit you just fine.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 08-19-2012, 06:33 PM   #6 (permalink)
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r4 needs a new driveshaft, which is a cost i'd like to avoid. I was thinking a TH350 from summit with a B&M floor shifter, mostly because I don't know shit about tv and kickdown cables and from what I understand if you mess the TV cable up you can kiss your tranny goodbye in like 20 miles.

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Old 08-20-2012, 07:45 AM   #7 (permalink)
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My 305 had a 250 Trans , when going to a 330 HP 350 cdi I wanted a 700R4 but the cost was too much for my wallet , but a 350 trans built to handle the HP was less than half the cost of a 700R4. (I also added a transcooler too)
It works well for me

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Old 08-20-2012, 11:54 AM   #8 (permalink)
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Messing the tv cable up, you will notice right away, and it's not that big of a deal. People freak out about driveshafts all the time, and I don't know why. When I rebuilt my tranny, I found out my driveshaft was too long from the factory, I couldn't get it back in. So I had it shortened, rebalanced, and new u-joints put on, all-in-all cost me about $100. With the kind of money you'll already be spending, I just don't see the big deal.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 08-20-2012, 03:14 PM   #9 (permalink)
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Basically what it comes down to is I wont be doing most of the switching myself. I learned a long time ago that while I CAN do it myself, it takes weeks with the little spare time I have, and even then I may have chewed something up in my ignorance. I'm aiming for maximum gains with minimum labor cost, and something that should for all intents and purposes drop right in, works great for me.

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