What do you think of this T5 Ratio?

ks65stang · Dec 8, 2011

T5 in questions is out of a 1984 Ford Mustang with a 302 engine tag number 1352-065. The gear ratios are as follows 1st=2.95 , 2nd=1.94 , 3rd=1.34 , 4th=1.00 , 5th=0.63 , R=2.76. This T5 is a non world class unit so it will use 70W gear oil not dexron like the world class units.

I plan to put this in a 65 Coupe w/ a mildy built 289 and a 3:50 rear end gear? Mildly built means Preformer RMP package w/ stock heads and long tube headers, nothing more. Should I buy this one? Or look for a WorldClass w/ a different ratio? Thanks!

65fastbackresto · Dec 8, 2011

I have 3.55 gears and the same T-5. It`s not a bad combo, although to run interstate you`ll have to run about 75mph in 5th or the motor isn`t in the sweet spot if you know what I mean, it kinda lugs under that. At least mine does, my cam is probably taller then yours though...

Let me know if you ever try and see how fast it`ll go at full throttle in 5th gear, I haven`t had the balls to try that yet...full throttle in 4th is plenty fast enough for my car.

ks65stang · Dec 8, 2011

I can't change my gears as they are all ready installed but I havent purcahsed the trans yet. This is just the specs of one I found locally and I am considering. So I should look for one w/ lower gears so I can use 5th @ about 65MPH. If the price is right I might just stick w/ this one......

woodsnake · Dec 8, 2011

I have that same T5, and agree, that at 70MPH, the engine is only turning 1400 rpm. I would rather had a taller gear than the 3.50, but am not ready for an upgrade at this time...

Realmongo · Dec 8, 2011

I have the same trans in my '84 GT that was rebuilt and upgraded by Astro Performance running an SVO 3.45 gear set which works out well although there are times I wish I had gone with the 3.73 gears. BTW, the '84 T5 trans is supposed to run ATF not 70w gear oil.

mtaqua · Dec 8, 2011

I've got 4.30's and the std overdrive gear in my T5 and I really wish I had the road race 5th gear. I can't drive it in 5th at 60mph.

iskwezm · Dec 9, 2011

I have the same trans with a 3:80 gear and 26" tall tires and 5th gear really isnt useable.I can use it, but to pass on the freeway, i need to down shift.

67GTFB · Dec 9, 2011

you could go for that tranny if 1) it's in good repair now and 2) you're not planning on high RPM launches, etc (aka "abuse" - drive it like you stole it) ..... most new T5z's have a .63 5th gear, but you could order special final gear if needed .... I have a moderate built 302 with a T5z, 3.55 rear and 245-50R16 tires (26.5") ..... my engine doesn't like to run below 1800 and jsut loves to run 2k+ through 4K (it can go higher) ..... I created a spreadsheet that shows speed vs RPM for each gear as a function of rear ratio ..... I used this tool to set my normal driving RPM range from 2K to 3K ..... with this setup my shifts vs speed are 0-20; 20-30; 30-40; 40+ for fourth ..... upshift to 5th is around 62-65, but with my cam, I can go as low as 60 for flat crusing (actually I can run at 55 if it's level) .... the engine has good bottom-end torque, so it responds well to throttle burps in 5th ..... enough about me .... if your build is a "mild" 289" then you should have good vacuum/torque on the low side and do just fine .... your final setup would be very close to mine and I really like thiat combo for street driving with the occiasional interstate accel ramp romp (just to blow out the carbon so to speak) ..... btw, I checked all of the spreadsheet calcs against actual performance using GPS and my readings are within 1 MPH .... used a 20 thooth driven speedo cable gear ..... hth --- 67GTFB

ks65stang · Dec 9, 2011

The guy says he sells his rebuilt Non-World Class for $350-$400 and his World Class for $650.00. My engine will be very mild. I want this car to be functional, OK gas milage, used often and taken on 125 mile trips. What do you think? I'm leaning towards buying it......then I got to gather the rest of the parts to swap out the old C4 which I may put in a Bronco II w/ a swap V8 (If I ever get to it).

Rmoore45 · Dec 9, 2011

I would get the world class T-5. Probably better in the long run and not that much more expensive. I have a world class t-5 in my '67 with a mild 289 and I like it.

ks65stang · Dec 9, 2011

FYI I'm running a 245/45/17? I just measured the tires are about 24.5" tall?..............

Realmongo · Dec 10, 2011

There are 3 main differences between the WC and Non-WC T5 transmissions. The WC uses needle bearings under its gears, it has fiber synchronzers, and the countershaft bearings are tapered roller bearings. The Non-WC T5 transmissions uses journals as the bearings under the gears, it uses brass synchronizers, and its countershaft bearings are straight roller bearings.

PoppyMod · Dec 10, 2011

ks65stang said:
T5 in questions is out of a 1984 Ford Mustang with a 302 engine tag number 1352-065. The gear ratios are as follows 1st=2.95 , 2nd=1.94 , 3rd=1.34 , 4th=1.00 , 5th=0.63 , R=2.76. This T5 is a non world class unit so it will use 70W gear oil not dexron like the world class units.

I plan to put this in a 65 Coupe w/ a mildy built 289 and a 3:50 rear end gear? Mildly built means Preformer RMP package w/ stock heads and long tube headers, nothing more. Should I buy this one? Or look for a WorldClass w/ a different ratio? Thanks!

It sounds like you're looking at a T5z with those ratios. It's a nice tranny. I'm running a 3.55 with 25.6" wheels and at 70mph, I'm taching about 1950-2K Rs.
Good luck!

robbz28 · Dec 11, 2011

Just double check that tranny tag and make sure the input shaft is the correct diameter, I had a NWC sold to me and the guy said it came out of a 5.0 and i put a dial caliper on the stem of the input shaft and found out that it actually was for a 4 cyl. I told the guy and he didnt believe me, basically called me a liar....said he personally pulled it out of a 5.0....so I took a picture of the measurement, emailed it to him and he had to eat the shipping and send me a new transmission...so all's well now.

Realmongo · Dec 11, 2011

robbz28 said:
Just double check that tranny tag and make sure the input shaft is the correct diameter, I had a NWC sold to me and the guy said it came out of a 5.0 and i put a dial caliper on the stem of the input shaft and found out that it actually was for a 4 cyl. I told the guy and he didnt believe me, basically called me a liar....said he personally pulled it out of a 5.0....so I took a picture of the measurement, emailed it to him and he had to eat the shipping and send me a new transmission...so all's well now.

Glad you mentioned that, I had forgotten the 2.3L horror stories.

ks65stang · Dec 18, 2011

Anyone have an educational T5 link so I can do my research so I know what I'm buying is actually what is supposed to be? Thanks

It sounds like you're looking at a T5z with those ratios. It's a nice tranny. I'm running a 3.55 with 25.6" wheels and at 70mph, I'm taching about 1950-2K Rs.
Good luck!

Click to expand...

This is exactly where I want to be, I may have slightly higher RPMs due to the slightly smaller tire.

Realmongo · Dec 18, 2011

A good place to start is TREMEC's website. You can download the service manual for free:

http://www.tremec.com/performance/

horseballz · Dec 18, 2011

Here are some info sources. The Modern Driveline link gives a bit of info on how to tell a World Class from a non World Class if the tag is missing.

http://www.allfordmustangs.com/Detailed/349.shtml

and another:

http://www.fordmuscle.com/archives/2000/09/t5swap/index.php

and:

http://www.moderndriveline.com/Technical_Bits/t5_history.htm

HTH,
Gene

What do you think of this T5 Ratio?

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