Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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IaTR6
Dennis Costello
Central Iowa
(134 posts)

Registered:
12/29/2007 02:53PM

Main British Car:
'73 TR 6 '97 Explorer 5.0

Re: Changing 5th gear ratios on Ford t5
Posted by: IaTR6
Date: October 11, 2018 12:36PM

Tim, If you are at 3500 rpm, and using .63 overdrive, you should read 2205 rpm in 5th. At 4000 in 4th, a .63 5th would give 2520 rpm.
A 3500 to 2500 change is .71, and 4000 to 3000 is .75. Is it possible you have a .73 now, since that would fall within the error of the tach reading?
When I look at my listing of T5's, the .63 5th ratio seems fairly rare. It would mean taking the tail housing off, but for a 2.95 first gear, the overdrive gears should be 25/51T. I assume the aluminum tag with the 1352-11-___ is missing? Is there a partial VIN on the right side of the case on the mounting flange? (outside
surface, not on the bell housing face)
If so, it may be possible to identify the transmission. Case casting numbers are less reliable, but may help also.
Dennis


tbo
Tim Body
St Thomas Ontario
(203 posts)

Registered:
01/27/2013 06:47PM

Main British Car:
1954 Triumph TR2 stock 2 litre

Re: Changing 5th gear ratios on Ford t5
Posted by: tbo
Date: October 17, 2018 09:44AM

Finally saw how to access the Speed /RPM calculator and got some interesting info.In 4th at 3000 rpm /60mph with the .63 5th gear the revs drop to 1849 a difference of 1085 rpm. With the.73 5th gear the rpm drops to 2142 a difference of 792. With a .80 5th gear the rpm drops to 2318 a difference of 606 rpm . Available Horsepower between 2000 and 4000 is(don't laugh) 85 to 90 . So can I switch to the .73 gears and not have to find a WC trans which will accept the .80 gear set or just plat it safe and go there any way. Of course I have to find a WC trans in good shape with the 295 .63 configuration and then the .80 gear kit . All of that is fraught with problems too.I need a gambler from Vegas to tell me the odds.!! Thanks for the graph Carl


tbo
Tim Body
St Thomas Ontario
(203 posts)

Registered:
01/27/2013 06:47PM

Main British Car:
1954 Triumph TR2 stock 2 litre

Re: Changing 5th gear ratios on Ford t5
Posted by: tbo
Date: October 20, 2018 08:59AM

Hi Dennis. As you can see I did all of my calculations at 3000 or 60 mph. As to the trans ,the chap I bought it from had it in a 68 Mustang . He is an engineer BTW and was putting a big block in the car and another trans. He said the trans was out of an 83 Capri which means it sould be 1352-065 Of course the tag was missing so I had to take his word I think we checked the 5th gear by manually rotating the input shaft and it checked out but .63 or.73 who knowsI think fo now I'm putting the car away and working on a TR3 that taking up all the room in my heated garage.Maybe i'll get lucky and find the correct WC trans over the winter.If any body has any ideas please send me a PM Thanks Tim


ex-tyke
Graham Creswick
Chatham, Ontario, Canada
(1031 posts)

Registered:
10/25/2007 11:17AM

Main British Car:
1976 MGB Ford 302

authors avatar
Re: Changing 5th gear ratios on Ford t5
Posted by: ex-tyke
Date: October 20, 2018 09:51AM

Quote:
we checked the 5th gear by manually rotating the input shaft and it checked out but .63 or.73 who knows...
If done carefully, you should be able to distinguish between a 0.63 and a 0.73 fifth gear.
I have a spare Ford T5 in the garage with a 3.35 first and 0.63 O/D - all gear ratios identifiable using the input/output turn test.


tbo
Tim Body
St Thomas Ontario
(203 posts)

Registered:
01/27/2013 06:47PM

Main British Car:
1954 Triumph TR2 stock 2 litre

Re: Changing 5th gear ratios on Ford t5
Posted by: tbo
Date: October 21, 2018 12:32PM

Hello Graham . Nice to hear from somebody local. When I bought the trans about 3 years ago I knew very little about T5s .63 .73 what does that matter. Do you know of anyone with a spare t5 from an 85 mustang? that would be 1352-126 WC with a 335 first and a .80 5th Just the one I need! I think I'll post an ad on Kijiji and see what happens. If you seek you might find .As far as the trans being .63 or .73 I can find out when I pull it . I know for sure it's too tall Tim


ex-tyke
Graham Creswick
Chatham, Ontario, Canada
(1031 posts)

Registered:
10/25/2007 11:17AM

Main British Car:
1976 MGB Ford 302

authors avatar
Re: Changing 5th gear ratios on Ford t5
Posted by: ex-tyke
Date: October 21, 2018 01:52PM

If you know the vehicle application(s) for the 1352-126, then you can search wrecking yards on this site.
[www.car-part.com]


mgb260
Jim Nichols
Sequim,WA
(1915 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Changing 5th gear ratios on Ford t5
Posted by: mgb260
Date: October 21, 2018 04:26PM

Tim, The Turbo four T5's had a .79 OD. They have a 3.97 first though too.



tbo
Tim Body
St Thomas Ontario
(203 posts)

Registered:
01/27/2013 06:47PM

Main British Car:
1954 Triumph TR2 stock 2 litre

Re: Changing 5th gear ratios on Ford t5
Posted by: tbo
Date: October 22, 2018 07:38AM

Hi Jim.I have three 4 cylinder t5s and I'm pretty sure one is a Turbo but the input shaft is longer and my custom Triumph bellhousing is made specifically for the v8 length input shaft. . I really like the 295 first gear I have now but the 335 first would be OK so the 85 Mustang 1352-126 would solve all my problems. Just have to find one or build one . Tim


ex-tyke
Graham Creswick
Chatham, Ontario, Canada
(1031 posts)

Registered:
10/25/2007 11:17AM

Main British Car:
1976 MGB Ford 302

authors avatar
Re: Changing 5th gear ratios on Ford t5
Posted by: ex-tyke
Date: October 22, 2018 09:32AM

Here's a handy chart for identifying T5 applications and gear ratios - maybe there's another xsmn application/part that might suit
[www.britishv8.org]


tbo
Tim Body
St Thomas Ontario
(203 posts)

Registered:
01/27/2013 06:47PM

Main British Car:
1954 Triumph TR2 stock 2 litre

Re: Changing 5th gear ratios on Ford t5
Posted by: tbo
Date: October 22, 2018 06:54PM

Thanks Graham . I really appreciate that but I've been studying that chart ever since I decided to put a 2.3 Ford Turbo into a TR3 I'm restoring thee or four years ago.I/ve had some health issues since then and have decided to finish it as stock and sell it .So I put the a T5 in my TR2to get a nice five speed with no electrical issues. Tired of 3000 rpm at 60 mph . Still any help is always good Tim
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