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Stupid question about GM atuos...


coltboostin

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Is a standard non-Hydro a 2 speed or something?

 

Also from what I gather, the Th400 would be a much better option, especially in stock form. You guys agree?

all auto trans are basiclly hydro, they are fluid couplers and controlled with hydraulic pressure's and valves

still a hydro (2 speed). th400 will rob power vs a th350 in stock forms

 

th400 internals are heavyer and take more power to turn. the glide(2 speed) is for littler cars under 2800 pounds.

 

i would need more info on weight, power and intended use etc

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all auto trans are basiclly hydro, they are fluid couplers and controlled with hydraulic pressure's and valves

still a hydro (2 speed). th400 will rob power vs a th350 in stock forms

 

th400 internals are heavyer and take more power to turn. the glide(2 speed) is for littler cars under 2800 pounds.

 

i would need more info on weight, power and intended use etc

 

I know this, but what is the difference between T350, and TH350?

 

Are you telling me a TH400 is a 2 speed? I though it was a 3 speed?

 

The glide is nice, but with a big turbo you have to spray the bejesus out of it to get it off the line.

 

 

Weight-2600lbs

 

Intended use-breaking the sound barrier. 9's on gas and all boost. 40 roll domination....

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never heard a a t350 only gm trans i know of a th350 and 400

they are both 3 speeds, 400 is much larger and heavyer all around! 400 will take more in stock form, but some easy mods can be done to the th350 to make it comparable and not rob as much horse as the 400.

 

and depending on rear gearing and tire size

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The 400 is heavier and takes more power to turn as said , it is intended for high torque in stock form, in the aftermarket racing world , do your homework and call a place like coan for some real specifics when trying to weigh your choice versus budget.
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and the glide you can get different drive ratios for (first gear that is). 1.76 and 1.82 are stock but there are aftermarket ones out there that go in the 2.10 or so range.
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never heard a a t350 only gm trans i know of a th350 and 400

they are both 3 speeds, 400 is much larger and heavyer all around! 400 will take more in stock form, but some easy mods can be done to the th350 to make it comparable and not rob as much horse as the 400.

 

and depending on rear gearing and tire size

 

Rear gear? Dont they both have 1.1 finals?

 

 

Im stuck with a 4.11 rear. Tire size will be around 24.5

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yes all have final of 1 to 1

 

but gearing in first and second are not the same

 

basic, a glide is just 2 and drive. th350/400 was 1, 2, drive

but the gearing for 2 in a glide can be changed from 1.76/1.82 to something else aftermarket like 2.00 or higher, depending what is out there in the aftermarket. but with 4.11 and that short of a tire, your going to be spinning any motor hard and high on the big end. its all going to come down to gearing!

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Sounds like you need a built AOD

 

700r4 just dont give 4th full power

 

 

but with a 24.5 tire, 4.11 gears in top gear(3rd) it looks like this!

 

8000 RPM 141.87 MPH

7500 RPM 133.01 MPH

7000 RPM 124.14 MPH

6500 RPM 115.27 MPH

6000 RPM 106.41 MPH

5500 RPM 97.54 MPH

5000 RPM 88.67 MPH

4500 RPM 79.80 MPH

4000 RPM 70.94 MPH

3500 RPM 62.07 MPH

3000 RPM 53.20 MPH

2500 RPM 44.34 MPH

2000 RPM 35.47 MPH

1500 RPM 26.60 MPH

1000 RPM 17.73 MPH

 

this will help with gearing!

http://www.wallaceracing.com/Calculators.htm

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I've used gear calculators when I was setting up the Colt for the standing mile-I crossed 200mph at 7600rpm in 5th gear. I did not realize how much a 1.1 would kill me.

 

The 700r4 looks like a great option now-

 

 

Turbo 350 2.52 1.52 1 N/A

Turbo 400 2.48 1.48 1 N/A

2004R 2.74 1.57 1 0.67

700R4 /4L60 3.06 1.63 1 0.7

4L80E 2.48 1.48 1 0.75

 

 

 

Pro's/Con's? Is it strong in stock form? And- is the Overdrive really that weak?

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I've used gear calculators when I was setting up the Colt for the standing mile-I crossed 200mph at 7600rpm in 5th gear. I did not realize how much a 1.1 would kill me.

 

The 700r4 looks like a great option now-

 

 

Turbo 350 2.52 1.52 1 N/A

Turbo 400 2.48 1.48 1 N/A

2004R 2.74 1.57 1 0.67

700R4 /4L60 3.06 1.63 1 0.7

4L80E 2.48 1.48 1 0.75

 

 

 

Pro's/Con's? Is it strong in stock form? And- is the Overdrive really that weak?

 

od is the weak link in the 700r. i wouldnt put a stock one behind a 400hp v8

 

http://www.transmissioncenter.net/700MegaRaptor.htm this site has so many write ups on it it not funny. and you can buy the parts you need or buy one built! id talk to them about 4th, cause i dont think you'll have enough tq to break it!

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od is the weak link in the 700r. i wouldnt put a stock one behind a 400hp v8

 

http://www.transmissioncenter.net/700MegaRaptor.htm this site has so many write ups on it it not funny. and you can buy the parts you need or buy one built! id talk to them about 4th, cause i dont think you'll have enough tq to break it!

 

My last motor made 505ft lbs, an that was not turned up.:bangbang: Thats only for a 2500rpm span.

 

 

I would like the OD to hold up for top end pulls though....

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od in any car is the issue, think about the physics of it. 4th gear top end run youre pushing so much weight against the drive line, when you go into od, you can almost double it! doubling the load against the motor.

 

think taller tire! or lower rear gearing

 

with 24.5 tire

8000 RPM 141.87 MPH

7500 RPM 133.01 MPH

7000 RPM 124.14 MPH

6500 RPM 115.27 MPH

6000 RPM 106.41 MPH

5500 RPM 97.54 MPH

5000 RPM 88.67 MPH

do the same math it a 26" tire

8000 RPM 150.56 MPH

7500 RPM 141.15 MPH

7000 RPM 131.74 MPH

6500 RPM 122.33 MPH

6000 RPM 112.92 MPH

5500 RPM 103.51 MPH

 

now with a 26" tire and say 3.55 gears

8000 RPM 174.31 MPH

7500 RPM 163.42 MPH

7000 RPM 152.52 MPH

6500 RPM 141.63 MPH

6000 RPM 130.73 MPH

5500 RPM 119.84 MPH

 

not many use OD at WOT. plus you're doubling the strain on the bottom end,

 

the supra that used to run the west side had 4.11 gearing. 27" tires and a glide.

but had one nasty SBC in it with 2 spray plates. when trying to build a car for roll and drag gearing is what is going to break you, and it will hurt one or the other! that and the down side to short sidewall tire is the fact that dont wrinkle for the HOOK! cause theres no sidewall

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od in any car is the issue, think about the physics of it. 4th gear top end run youre pushing so much weight against the drive line, when you go into od, you can almost double it! doubling the load against the motor.

 

think taller tire! or lower rear gearing

 

with 24.5 tire

8000 RPM 141.87 MPH

7500 RPM 133.01 MPH

7000 RPM 124.14 MPH

6500 RPM 115.27 MPH

6000 RPM 106.41 MPH

5500 RPM 97.54 MPH

5000 RPM 88.67 MPH

do the same math it a 26" tire

8000 RPM 150.56 MPH

7500 RPM 141.15 MPH

7000 RPM 131.74 MPH

6500 RPM 122.33 MPH

6000 RPM 112.92 MPH

5500 RPM 103.51 MPH

 

now with a 26" tire and say 3.55 gears

8000 RPM 174.31 MPH

7500 RPM 163.42 MPH

7000 RPM 152.52 MPH

6500 RPM 141.63 MPH

6000 RPM 130.73 MPH

5500 RPM 119.84 MPH

 

not many use OD at WOT. plus you're doubling the strain on the bottom end,

 

Im stuck with the gear, Im keeping the IRS-and can only go so large with the tire.

 

I NEVER had a motor or trans issue any time I was over 180mph, not once. I agree its more strain, but thats what I like to do, its what I need to do. If its not going to like the big end, then its not for me.

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Im stuck with the gear, Im keeping the IRS-and can only go so large with the tire.

 

I NEVER had a motor or trans issue any time I was over 180mph, not once. I agree its more strain, but thats what I like to do, its what I need to do. If its not going to like the big end, then its not for me.

 

1800lbs

vs what 2600? big difference and fwd vs rwd

 

isnt there different gearing for the IRS?

 

that or find a manual trans!

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1800lbs

vs what 2600? big difference and fwd vs rwd

 

isnt there different gearing for the IRS?

 

that or find a manual trans!

 

Colt was 2250lbs empty. Figure 2500 race weight.

 

I agree its different, and I dont want to spend the $ on a T56 right now- so I was going over my reasonable options.

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If you go with a 700R4 for top end runs make sure you get one with either a manual valve body or one that doesn't kick out of OD at wide open (Some GTA spec valve bodies I think??). Otherwise it'll want to drop back into drive past a certain throttle input... not so great for balls out high end speed.

 

I would assume most high-$ 700s will already have this addressed, but if you piece it together yourself on the cheap, don't forget that part.

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