Quote:
|
Originally Posted by Edahall My 1987 Allante has a bad F-7 transmission. It doesn’t engage in any gears and doesn’t make any noise. I took it to a transmission place that knows how to rebuild these things and they named some incredible price to rebuild this transmission. I refused to have this done so I towed the car to my place so I could look at some options.
The first and most attractive option is to find a 440-t4 from an 88/89 Eldorado. The transmission guy told me that this would not work because the Eldorado had a 4.5L engine while mine has the 4.1L. I don’t see why it won’t bolt up because both engines use the same block. Am I correct?
He then told me another problem is that the 440-t4 is non-electronic and the check engine light on the dash would be on all the time. This I agree with him on this although I can always ignore the light. Also, I don’t see why I can’t fool the computer into thinking that it has the right transmission. The computer just runs several solenoids and that can easily be mimicked. Then I will never have to worry about those solenoids that no longer available.
I also understand that the 440-t4 is not as strong as the F-7. But there are shift kits sold by either Superior or Transgo that can be installed on the 440-t4 that should make it strong enough to handle the extra 15 hp that the Allante engine puts out.
The second option is to buy a rebuilt transmission from a place like the following. http://www.rebuilt-car-transmissions.com/cadillac-allante-1987-transmissions---20586214.html
This is a whole lot cheaper than the quote I got. Any comments on this option? The third option is to try rebuilding the original transmission myself. I have no problems rebuilding the 440-t4 but I’m afraid there might be enough differences with the F-7 such as hard parts that can no longer be bought. |
Some things to consider:
There are definitely hard part differences between the F7 and the 440t4. The F7 was used in all Allantes through '92 and the 89-92's had 4.5 engines so that shouldn't be an issue.
From everything I've heard, there should be no issue with compatibility between the block and the trans.
There may be subtle electronic differences in the wiring harness, but nothing that should cause an issue with the ECM - I believe the control commands are essentially the same. The schematics should be on the web somewhere. Some wires may need to be swapped around as the pins on the connectors did change a bit, if I recall.
Torque converters supposedly varied greatly with various installations of the 440t4. May want to use the original F7 converter if you're sure its good.
I believe there were several final drive ratios offered on these transaxles. You may be able to swap in your chain and sprockets to duplicate the original.
I'd probably try and go with a later model (the 4t60 is the 440t4, but the 4t60
E is a different trans) as there were improvements as with any production run.
440t4s are pretty inexpensive. Might be worth trying just to see if it would work. The hardest part is installing the darn thing. May be worth finding a running car with a 440t4 so you know it works and then swapping it into your Allante. If I recall, 440t4s were used in everything from Fieros to full-size Caddy's and Buicks.
May want to give Anthony Cipriano a shout and see what he thinks.
