Thoughts after 3.80 gear change.

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69stang_250
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Thoughts after 3.80 gear change.

Post #1 by 69stang_250 » Thu Apr 05, 2018 3:33 pm

So I just go home and got to do some driving in the mustang after the gear change and here is my opinion. 4cyl t5 with 3.80 gears works great around town. If you just want to run from stop light to it’s pretty good, but 1st is super slow and if you are cruising down the interstate at 80 with flow mast 40s on, it is way too loud.

2nd, 3rd, and 4th is fast though! I have done a lot of stop light to stop light races around town and I can say that every 90s model mustang, comaro, and firebird ive been up next to gets left by a car length. Guys, don’t worry about HP.... torque is makes a car so much more fun to drive!

So with all that, I found a guy with a rebuilt 93 2.95 first t5 that I got a deal on and will be installing it tomorrow. Considering how hard my car pulles with the 2.34 2nd and 1.46 3rd I have a feeling that it will be significantly faster with 1st, 2nd, and 3rd or the new gear box.

Anyone that sees this I do have a question about clutches. I’ve got the stock flywheel and am wondering what is the largest clutch I can put on it and should I try and go with a king cobra clutch if I can go that big with the 157 tooth flywheel? Or is a fairly stock clutch fine with the power that these built 250s make?
69 mustang coupe, 250 .030 over, forged pistons, port & polished CI AL head 54cc's 10.25CR, 280/280 Clay smith cam 1 degree advanced, 1.6 adjustable rockers,
Re curved DSII, MSD AL6, CI Intake, FITech 400HP fuel injection. T5 trans, 8" rearend w/3.80 gears, Eaton trutrack.

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bubba22349
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Re: Thoughts after 3.80 gear change.

Post #2 by bubba22349 » Sun May 20, 2018 11:33 pm

:beer: congrats yes i also think the V8 trans is a way better way to go with a 250 six after all even stock a 250 will out run most V8 from a stop, so a 4 cylinder T5 is likely holding it back. :hmmm: what size clutch are you running now? I would think that you could get a 10 or maybe even an 11 inch clutch inside the bell housing. Good luck :nod: :thumbup:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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powerband
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Re: Thoughts after 3.80 gear change.

Post #3 by powerband » Mon May 21, 2018 2:16 pm

Anyone that sees this I do have a question about clutches. I’ve got the stock flywheel and am wondering what is the largest clutch I can put on it and should I try and go with a king cobra clutch if I can go that big with the 157 tooth flywheel? Or is a fairly stock clutch fine with the power that these built 250s make?

THREE PEDALS RULE !

250/SBF small-157 tooth FW will accept most SBF HP small-FW clutches. With my Tri-Power 250 - 3.80 rear - T5 Comet and the Supercharged 250 Maverick , I use the Centerforce weighted arm clutch set with no slippage on street or track . The 'weighted' arm clutches maintain near stock-pedal fee with much greater clamping force when spun up. The Comet had a 3.35 first gear T5 with now has 2.95 first gear T5 and is just about perfect gearing, I can drive to the track on the interstate in OD , race all day and drive it home ...


https://www.summitracing.com/parts/ctf-cf360030

https://www.summitracing.com/parts/ctf-280490

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