g-force rebulid or tremec

I think i have read the gforces are a smoother shifting tranny when compared to the tremecs but i dont have first hand knowledge.

I think the gforce can be done for cheaper and its also lighter. You wont have to worry about buying a new shifter either.

I plan on going with a gforce when money permits.

The TKO's come with a hurst already on them. I love mine, Very smooth shifting. I've got about 1500 miles on the TKO so far. Great trans! should cost you around 1600 for the TKO and about $200 for a matching bell, You will need a new clutch as well.
Hope this helps!

arent the gforces straight cut gears, i heard straight cut gears are noiser as seen in the video that was posted in the last gforce thread, but also i was led to belive that a straight cut gear is more knoctchy and harder to shift.....is this true? Gforce still has synchros?

igotyofire said:

arent the gforces straight cut gears, i heard straight cut gears are noiser as seen in the video that was posted in the last gforce thread, but also i was led to belive that a straight cut gear is more knoctchy and harder to shift.....is this true? Gforce still has synchros?

Click to expand...

No, not all of them. Astroperformance offers different levels on the G-Force tranny. They are helical cut gears... they do have synchros. The straight cut option they recommend not to use for daily driving.....and I beleive these do not have synchros.


Also, from what I can catch, the gears are straighter cut than regular T-5 gears... but they are not considered "straight cut".

G-Force makes a synchronized helical cut as well as straight cut gears. The straight cut are called dog ring gears. The dog ring setups are not synchronized and G-Force recommends them only for track use. That said, the helical cut on the gears are definitely more relaxed than stock. This makes them noisier. The GF is new and has a lot to prove. It has to contend with Tremec's longstanding history in street cars. G-Force won't even commit to any number on their torque rating for the GFT5. There is no proof that a GF is comparable to a Tremec in performance nor is there proof that it's not a viable alternative. The only thing we can go by is the experiences of a few people on the internet.

There's no arguing the number of comments/complaints about the shifting characteristics of the Tremec box. Just do a search on the Mustang boards. At the end of the day, some like it, some don't. That boils down to personal preference. The guys that have Tremecs love it.

You have to decide what you want and how much work you want do.

G-Force T5:
Fairly new in the market - no proven record
Noisier than stock
No exact number for torque capacity (somewhere in the 500-600 range)
Direct replacement - uses T5 case
Uses the T5 shifting mechanics
Uses your existing shifter
Requires 26 spline clutch disc

Tremec:
Heavier than the T5
Long successful track record with Mustangs
Uses a different shifting mechanics
Requires 26 spline clutch disc (for TKO 600)
Requires new bell housing
Requires new shift fork
Requires new tranny cross member
Requires drive shaft spacer
Requires specific shifter not compatible with T5

That's about all I can think of. There is a lot of GFT5 info on corral.net. Do a search over there.

anyone remember the video of that guy drivin around with his gforce , i have it if someone wants to host, but i was curious as to which one he had becuz it was very loud, dont remember which member that was

I've got a Tremec in my 95GT.
Everybody says they are totally bullit-proof.
Its BIG and it shifts a little rougher and is a little noisy.
The guy I bought it off of said it was tough getting it to fit.
You can probably add a new driveshaft to that list of stuff you'll need.

I used to drive 200+ miles a day for almost a year. I like how it shifts better than the stock t5. It feels stronger. It does allow more noise into the cabin, but I reduced it alot by adding additional insulation around the shifter. My wife likes it much better as well. Hope this helps.

From Tony at Astro Performance:

G-Force T-5 Transmissions were built to withstand more power than what their "ancestors" did. When G-Force designed the Gear Kit, they were expecting customers to put them in cars, and maybe run High 11's/Low 12's consistently without any problems. However, as some of you have stated this "Mark" has been well surpassed.

The main reason people like the T-5 is because of the "Shifting Characteristics". In my opinion, you can get a T-5 to shift better than any Tremec. The T-5 is also 30 lbs. lighter than a Tremec. Some people put the Tremec's in, and get upset because the Car actually slows down with the new transmission. I personally sell both styles of Transmissions, and have noticed in the past year we have actually been selling more G-Force T-5's than Tremec's. One problem being the availability of the Tremec's.

Today, we can build a T-5 with a G-Force Gear Kit to support the same power that a Tremec TKO-500 is rated at. However, we cannot build a G-Force to accept the same power as a Tremec TKO-600. The TKO-600 is by far the strongest Transmission on the market. But, the TKO-500/600's shift exactly the same as did all the old TR3550's and TKO's. Some say "Notchy".

I am not a Huge Fan of the G-Force Straight Cut/Dog-Ring Gear Kit. Yes, I have built transmissions with this Gear Kit with success. However, we have noticed that under load the Straight Cut Gears tend to "grow/spread". And when this happens, the actual gears do not make complete contact with the gear that it "mates" with. Added Pressure to the "tips" of the gears is not a good thing. We have seen that in cars that have 28" Tall Tires and Larger, and having a Numerically Higher than a 4.88 Rear End, with 550 +HP are the guys that have been breaking the Straight Cut/Dog-Rings. Not all, but some. I personally like the Helical Cut/Dog Ring as far as Race Transmissions are concerned. All of the Gears in the Transmission "gravitate" towards the center of each other.

With that being said, the most reliable, practical, economical way of getting into a G-Force for an average 550HP Street/Strip Racer is the Helical Cut/Synchronized G-Force T-5.

Tony Sarvis
tony@astroperformance.com

This was taken from Corral.

Watch these two videos. They illustrate the shifting characteristics of each Tranny (Tremec is the first link, G-Force is the second link) Pay attention to the speed of the shifts for each transmission. Even watching my personal friend at the track, I noticed that his shifts took longer with the Tremec.

http://www.x2cmotorsports.com/X2CMovies/video1.html
http://www3.telus.net/sracing/89lx1.mpeg

Don't forget that Tim Matherly is running consistent 9's every weekend with a G-Force tranny. He has some extra bracing welded on his case, but not much. I've asked him about it and he really likes it alot and suggested it for my car.

The input shaft for the 94-95 comes only in a 26 spline.

P.S. Thanks for serving and be safe!!