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[Gasman4u2247]

I have an 84 T type that is basically a Frankenstein car, I plan to swap a Pontiac 400 into the car and I am wondering what issues will I run into? I would like to keep the transmission in the car, I assume the motor will bolt to it, I understand the transmission may not appreciate the replacement of displacement, but it’s my wife’s car so it probably will hold up just fine. Should I use the TC from the 3.8 or the 400 or go after market?

 

[ck80]

I'd go aftermarket.

If, IF ITS ORIGINAL (has 'D5' stamped all around) it will be a 12" 2200 stall speed.

Pontiac motors are way torquier than what was in that ttype originally.

As with every combo, decide on what tire you're going to run, then optimize your rear gear and stall speed with you're engine power/torque bands for your intended purposes with your desired trans.

Wouldn't hurt to have someone poke around the trans and find out what you've got, it may have upgrades and would like some if it doesn't.

When you say Frankencar that doesn't tell us what motor/trans are in it now, as it was popular for hot air trs to get chebby swaps. A chebby transmission doesn't mate to bop motors, unless its dual pattern case, or has an adapter.

 

[fleming442]

.....and the frame pads/motor mounts

 

[Gasman4u2247]

.....and the frame pads/motor mounts

I took the entire driveline, engine, transmission and rear from the t type and put it on the donor frame/body (New York rust are that one up bad). So it currently has the hot air 3.8 with the 200r4 and the 8.5” with I think 3.73 gears. I wish I had gone V-8 from the start but I always wanted a turbo regal, but since then I acquired an 86 GN So I now have one and can go a different direction with the FrankenT

 

[ck80]

I took the entire driveline, engine, transmission and rear from the t type and put it on the donor frame/body (New York rust are that one up bad). So it currently has the hot air 3.8 with the 200r4 and the 8.5” with I think 3.73 gears. I wish I had gone V-8 from the start but I always wanted a turbo regal, but since then I acquired an 86 GN So I now have one and can go a different direction with the FrankenT

OK. So let's clear it up. You don't have a ttype, you have a regal clone. (It's a small distinction, but it matters because there were lots of little minutiae on a REAL turbo car this one won't have unless you spent hours moving heat shields, climate boxes, upgrading to larger fuel lines, moving the gas tank, in tank vs in line fuel pump, etc.)

Factory rear would be 3.42 gears if it was original to the ttype donor car.

You don't have the quick ratio steering box or the upgraded sway bars etx... unless those moved too. Same with brakes. I assume you're running basic regal vacuum brakes in the donor?

Now it's still worthwhile checking the transmission for what valve body tag you've got. Again, different ones are slightly better than others. Not a huge difference, but, it's always best to start a build knowing exactly what you start with. That's what's tough with Frankencars, as you do your build and work through ideas it's harder to know exactly what you're working with.

If you call the car a ttype, which again, sounds like a less rusty plain Jane regal was a shell for an engine trans and rear, people start to make assumptions. That's going to make a bunch of advice come out wrong in a bigger build thread - which I hope you make, sounds worthwhile.

So, I'd recommend this. Pull it apart and catalog exactly what you have. Also find the motor you plan to use, find out the specs, decide what it will be built to, what cam, whether you're going carb or FI, etc. Because advice will vary.

 

[UNGN]

If the Converter is stamped D5, its the best factory converter for a 2004R. I would use it over any other Factory converter.

My D5 had gone 11.53@118 and 1.6 60 ft times and I expect it to go very low 11's @ over 120 mph when I get my T-type back on the road.