New Junkyard arrival

[street luge]

Hello

      Im still relatively new to the Cadillac game, but i was cruising the junkyard and cam across a 78 Toronado

did a bit of research and if im correct, came with a th425.

Is there anything different about this tranny or will it bolt up to a 70 eldo engine?
and is there anything else that will switch over from that car? 

(seats perhaps?)



              -mark

 

[73eldoconvert]

I do believe the transmission and final drive are the same but I think there is a different bracket/mount that attaches the final drive to the engine/mount. I think the bracket that holds the drive shaft extension is also different to mate with the olds block.

What are you trying to do?

 

[Ted in Olympia]

On the Eldorado the transmission were weaker in 77-78 than they were in 68-76.  Don't know why but I can tell you that I seen a lot more 77-78 with bad transmissions than the early ones.  I pulled a 78 out the other day that worked great but the oil looked as black as engine oil and I have a couple more in the lot that don't work.  Even the exchange book say they are a different number.

I would try to find a early one.  I have a few but I'm also in Olympia WA.

TED

 

[street luge]

Hmmm

        looks like it is more trouble than its worth, i was just curious to see if it was worth picking it up as a spare. (really don't feel like working for a few hours in a muddy field )

Up here in Toronto/ Hamilton area i have yet to see an Eldorado on the road or at the wreckers,

I'm just hoarding parts when i can. thx for the quick reply though



                                  -mark

 

[v8440]

On the Eldorado the transmission were weaker in 77-78 than they were in 68-76.  Don't know why but I can tell you that I seen a lot more 77-78 with bad transmissions than the early ones. 

I would guess because 1977 is the year they went to the 425, which I'd guess produced a fair amount less torque than even the castrated 1976 500.  Perhaps they dropped the torque capacity of the transmissions more than engine torque decreased?

 

[gary kosier]

A good part of it is they went to plastic thrust  washers for ease of assembly.
they don't hold tolerance for long and then everything goes to hell. 

Gary kosier

 

[grendel]

If you need a trans, I have a th425 that came out of a 71 El Dorado. 32K miles on the ticker.

You can have it for the cost of shipping and a bottle of wine. Might even be able to ship it cheaply through nhgpnut on this board.