[Stdyhand]

Well the time has come to rebuild my T5. I need a little information though. My car is a 91 GT. I believe the transmission is a 86, not the original one.

I have no idea what gear ratios it has for 1st and OD. I believe it is a 3.35 first gear because combined with my 410 gears my 1st is useless.

I am going to purchase a 2.95 z spec gear set but I want to know what my overdrive gear will be. To find this out I have to count the teeth on the gear set, right?

Which gears do I count and how do I multiply that to get the correct gear ratio for my overdrive gear?

I believe it is an 86 transmission which came with fiber lined syncros. Can I use carbon fiber lined syncros since I am changing to the z spec gears anyhow?

[ALEXLOPEZ62188]

I believe your overdrive should be at .60
Assuming you're reusing your original overdrive.
Mine are
1st: 2.95
2nd: 1.95
3rd: 1.36
4th: 1.00
OD: .60

I got an astro tranny. I think it's the same ratios

[e3sean]

Originally Posted by Stdyhand Well the time has come to rebuild my T5. I need a little information though. My car is a 91 GT. I believe the transmission is a 86, not the original one. I have no idea what gear ratios it has for 1st and OD. I believe it is a 3.35 first gear because combined with my 410 gears my 1st is useless. I am going to purchase a 2.95 z spec gear set but I want to know what my overdrive gear will be. To find this out I have to count the teeth on the gear set, right? Which gears do I count and how do I multiply that to get the correct gear ratio for my overdrive gear? I believe it is an 86 transmission which came with fiber lined syncros. Can I use carbon fiber lined syncros since I am changing to the z spec gears anyhow?

you would not want to use your old syncros that is the point of rebuilding it. and also unless you can locate the old style there is a new design on the syncros since the aftermarket company stoped making them tremic has redesigned the 3 peice syncro for 1st and 2nd and will only work as a 3 peice set.

[ryanw]

Originally Posted by e3sean you would not want to use your old syncros that is the point of rebuilding it. and also unless you can locate the old style there is a new design on the syncros since the aftermarket company stoped making them tremic has redesigned the 3 peice syncro for 1st and 2nd and will only work as a 3 peice set.

Does any one sell a upgraded kit to make the T5 bullit proof,( some thing that takes nearly all the week links out of the t5, for high horse power motors )that would make it economical over buying a newer trans ?

[StangBanger302]

Originally Posted by ryanw Does any one sell a upgraded kit to make the T5 bullit proof,( some thing that takes nearly all the week links out of the t5, for high horse power motors )that would make it economical over buying a newer trans ?

ASTRO or GFORCE makes kits. But is it economical? I don't think so...The GFORCE kit will run (me, through my tranny guy) about 2,000$ all said and done with the new clutch (different input shaft) and case/installation. Personally, I'm going to get a Tremec 3550 and have my guy look through it to make sure I'm good to go. They can be had WITH a bellhousing and shifter for around 900-1200 depending on who you buy from and how desperate they are. You can also just buy the tranny and use a bellhousing from an older mustang that used the SROD transmission. I believe years 80-83, don't quote me though. Uses the same clutch also. The TKO500/600 are based on this tranny and a local tuner around here runs 10.40s@132 in his car and it works flawlessly. He also has 240,000 miles on his car...Just trying to help, sorry for the long winded post

[ryanw]

Originally Posted by StangBanger302 ASTRO or GFORCE makes kits. But is it economical? I don't think so...The GFORCE kit will run (me, through my tranny guy) about 2,000$ all said and done with the new clutch (different input shaft) and case/installation. Personally, I'm going to get a Tremec 3550 and have my guy look through it to make sure I'm good to go. They can be had WITH a bellhousing and shifter for around 900-1200 depending on who you buy from and how desperate they are. You can also just buy the tranny and use a bellhousing from an older mustang that used the SROD transmission. I believe years 80-83, don't quote me though. Uses the same clutch also. The TKO500/600 are based on this tranny and a local tuner around here runs 10.40s@132 in his car and it works flawlessly. He also has 240,000 miles on his car...Just trying to help, sorry for the long winded post

Thats cool, my trans works great as of now, but i dont think its going to hold up once its pounded on

[StangBanger302]

Nope, sure won't lol. I considered the ASTRO or GFORCE kits and came to the conclusion that a Tremec 3550 is the most econimal/wise choice. Do some research on it.

[ryanw]

Originally Posted by StangBanger302 Nope, sure won't lol. I considered the ASTRO or GFORCE kits and came to the conclusion that a Tremec 3550 is the most econimal/wise choice. Do some research on it.

Whats the difference between the tremec 3550, 600, and 500

They all seem to be 5 speeds

[ALEXLOPEZ62188]

I went with an astro trans.
All said and done it came out to $1800.
I didn't wanna mess with tremecs just cause I didn't wanna piece it
Together.
My tranny guy also told me that TKO trannys don't shift as smooth as
an T5s or built one (Astro A5) north of 5500rpm..

[FastStang91Lx]

Originally Posted by ALEXLOPEZ62188 I went with an astro trans. All said and done it came out to $1800. I didn't wanna mess with tremecs just cause I didn't wanna piece it Together. My tranny guy also told me that TKO trannys don't shift as smooth as an T5s or built one (Astro A5) north of 5500rpm..

Very true info! And nice and light. That's why I'll go Astro as well! That is literally the next purchase.

[ryanw]

Originally Posted by FastStang91Lx Very true info! And nice and light. That's why I'll go Astro as well! That is literally the next purchase.

Never heard of astro......other the the astro van lol...... do tell, whats so great about them, how much do they cost, and wheres the best place to get them cheap ?

[FastStang91Lx]

Astro and G force are similar. Astro just trips my trigger, I guess. Astroperformance.com

[FastStang91Lx]

Anyone running a G-Force T5? Or astro T5? - Ford Mustang Forums : Corral.net Mustang Forum

[Stdyhand]

I figured I could get a 2.95 gear set good for 450hp from Astro, a level 4 rebuild kit with all new bearings, seals, and syncros, and before shipping it should be around $840. After shipping I'm probably looking at around 1k. Of course I still need to get a steel bearing retainer but I figured in the end I'll still save a few hundred over buying a T5.

Several are available for about 1300 but I could save 200-300 by doing it myself. I've looked at several sources on rebuilding one and it doesn't look at that difficult. My only problem is going to be time because I will be starting my floor pans also and I'm sure that is going to take some time.

[e3sean]

Originally Posted by ALEXLOPEZ62188 I went with an astro trans. All said and done it came out to $1800. I didn't wanna mess with tremecs just cause I didn't wanna piece it Together. My tranny guy also told me that TKO trannys don't shift as smooth as an T5s or built one (Astro A5) north of 5500rpm..

this was true until about 2 years ago. it was due to the syncro materal in the 3550 500 and 600 being brass however there are now aftermarket carbon fiber lined syncros that are made for them which allow 7k+ shifts and will shift nearly as smooth as a t5. the shift linkage in the tko setups are a little more complex then a t5 that is what causes the notchyness. the biggest advantage to the t5 is far less weight and less rotating mass.

if you are running a 302 based motor with 600 hp or less then an astro/ g forct t5 is the better option but a higher torque 351 based motor with 600+ hp is a gamble even with a g force or astro kit.

most times when a trans goes out even a stock t5 it isnt even due to gear weakness its uausally other part failure that starts the train to sheer teeth off sutch as excessive endplay causing misalignment of gears,forks breaking, shift hub clips breaking, low oil heating bearings.

[badshoe]

Sean, Ken here, are you in North Carolina now? Do you have plans to be at the Fun Ford Weekend at VMP this year?

[e3sean]

KEN!!!!! how have you been??? sir if i am home from my deployment and you are there i will go in a heartbeat to meet you in person, i owe you so much its not even funny.

[e3sean]

just looked it up. it is in july... i will be there and i will try to bring my car too.

[FastStang91Lx]

Sean, what do you think of the Astro T5's vs the TKO? More money, but same ratings, and less weight. And if you purchase the upgraded shift kit for the TKO, you're basically at the same price anyway, but it's heavier and you need supporting parts. This is using info from Astro's website.

[e3sean]

thats a tough decision. i would probibly choose the TKO. the small parts are beefier and less likely to fail. i have trust in the astro gearset but i have seen way too many other parts in a t5 fail under minor abuse espically fork pad supports,hub clips,springs,syncro dog teeth.

they do make solid brass hub clips,upgraded forks and fork pads and the round wire spring i have never seen fail but seems to have less tension..

but it is lighter and more compact...