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Topic: Changing 5th gear in TC T5 (Read 1459 times) previous topic - next topic

Changing 5th gear in TC T5

I was wondering if it is possible to put a higher (?) 5th gear in an 88 TC T5 to lower my revs on the freeway and increase my gas mileage, while retaining stock first through fourth gears (btw, this is behind a 5.0)...?  I also might put a mustang spec T5 in the car with 4.10's in the rear and want to do the same, but either trans...can it be done and how big of a job would this be?  How much would it cost to have a shop do it?
1988 Thunderbird Turbo Coupe
'89 5.0 w/ ported intakes, Mallory Adjustable FPR, BBK shorties and H with 2.5" Flows, 130 amp 3G, 89 Mustang comp/wiring, Aluminum radiator w/ elec fan, T5 trans, King Cobra clutch, 3.55 gears, 13" Cobra brakes (front), Wilwood prop valve, Mustang A-arms, Front Coil-overs, MM CC plates, Silver 17x9 R's, 03 Cobra IRS, Aluminum DS, 2002 Mustang dash/console etc..., custom leather seats

Changing 5th gear in TC T5

Reply #1 –
yep...get a T56....or better yet, a viper T56.
:america: 1988 Thunderbird Sport, Former 4.6 DOHC T56 conversion project.

Rest of the country, Welcome to Massachusettes. Enjoy your stay.

 
Halfbreed... Mango Orange Y2K Mustang GT
FRPP complete 2000 Cobra engine swap, T56 n' junk...
~John~

Changing 5th gear in TC T5

Reply #2 –
hahaha, yeah I wish..  as soon I can can afford that and stilll eat...

But really, the TC T5...?  Can it be done?
1988 Thunderbird Turbo Coupe
'89 5.0 w/ ported intakes, Mallory Adjustable FPR, BBK shorties and H with 2.5" Flows, 130 amp 3G, 89 Mustang comp/wiring, Aluminum radiator w/ elec fan, T5 trans, King Cobra clutch, 3.55 gears, 13" Cobra brakes (front), Wilwood prop valve, Mustang A-arms, Front Coil-overs, MM CC plates, Silver 17x9 R's, 03 Cobra IRS, Aluminum DS, 2002 Mustang dash/console etc..., custom leather seats

Changing 5th gear in TC T5

Reply #3 –
i dunno what the ratio is in the TC for 5th. i think most of the later T5s were like .82 or something. the T45 (at least one out of a mach1) is like .62 wich is the same actually as the T56 i have.
 
i suppose its possible but i dont have any info to support it at all...
:america: 1988 Thunderbird Sport, Former 4.6 DOHC T56 conversion project.

Rest of the country, Welcome to Massachusettes. Enjoy your stay.

 
Halfbreed... Mango Orange Y2K Mustang GT
FRPP complete 2000 Cobra engine swap, T56 n' junk...
~John~

Changing 5th gear in TC T5

Reply #4 –
This was discussed over on the Turbo Coupe board some months ago. Don't remember the outcome, but one of the members was talking with Hanlon to see if it could be done. Try a search over there...  http://www.turbotbird.com

As far as chainging the gears... 5th is in the tail housing, so I wouldn't think it would require a complete dissambly..

Changing 5th gear in TC T5

Reply #5 –
hmmm..interesting.  So it could be possible to combine the TC T5 main with my 89 Mustang Tail...?
1988 Thunderbird Turbo Coupe
'89 5.0 w/ ported intakes, Mallory Adjustable FPR, BBK shorties and H with 2.5" Flows, 130 amp 3G, 89 Mustang comp/wiring, Aluminum radiator w/ elec fan, T5 trans, King Cobra clutch, 3.55 gears, 13" Cobra brakes (front), Wilwood prop valve, Mustang A-arms, Front Coil-overs, MM CC plates, Silver 17x9 R's, 03 Cobra IRS, Aluminum DS, 2002 Mustang dash/console etc..., custom leather seats
 

Changing 5th gear in TC T5

Reply #6 –
Quote from: booksix
hmmm..interesting.  So it could be possible to combine the TC T5 main with my 89 Mustang Tail...?


The tail housings are identical... I meant 5th is mounted on the rear section of the main case and is enclosed in the tail housing. Its accesable by removing the housing and popping off a couple of snap rings.

The thing I don't know, is if the gears for 5th are actually different in the two versions(all the others definatly are, as are different versions of the 5.0 tranny). The final ratio may be determined by the by the tooth count on the cluster gear, as I believe 5th is driven from it.