GT47-88 First Gen

badpony93 said:
i'd raise the limiter, you might be rebuilding the trans again if you hit OD at WOT.
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I will not raise the limiter as I think the stock bottom end is on borrowed time as it is. 5950 is the current limit. If I shifted into od I would lift to say 50% then get back into it. I dont know if I want to put 3.73's in the truck. I think that that would be the best solution to my problem though.
 
Gen1SVE said:
I will not raise the limiter as I think the stock bottom end is on borrowed time as it is. 5950 is the current limit. If I shifted into od I would lift to say 50% then get back into it. I dont know if I want to put 3.73's in the truck. I think that that would be the best solution to my problem though.
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He means the speed limiter :thumbup:
 
slow94 said:
He means the speed limiter :thumbup:
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i meant the rev limiter, and why would you want lift to 50% throttle going down the track? bouncing off the limiter for 300 feet will go faster than lifting and getting it into OD. what size tire are you running?
 
badpony93 said:
i'd raise the limiter, you might be rebuilding the trans again if you hit OD at WOT.
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if you let a STOCK e4od shift o/d at wot with moderate power in front of it youre gonna have an overdrive planet failure. they are not designed to take that kind of load/abuse!!! and when that planet fails it takes alot of parts with it!
 
thePUNISHER said:
if you let a STOCK e4od shift o/d at wot with moderate power in front of it youre gonna have an overdrive planet failure. they are not designed to take that kind of load/abuse!!! and when that planet fails it takes alot of parts with it!
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PA built the trans twice and I believe it has a 6 pinion od planet. Yea called Harvey and it does have the upgraded od planet. His concern is the input shaft.
 
Gen1SVE said:
PA built the trans twice and I believe it has a 6 pinion od planet. Yea called Harvey and it does have the upgraded od planet. His concern is the input shaft.
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its a 4 pinion. why the input shaft? if youre that concerned about it, have it cryo treated. it wont break. they rarely break. ive got several 4r100s behind gen 2s (800ft/lbs, truck weight 5400lbs) and have never broke an input.
 
thePUNISHER said:
its a 4 pinion. why the input shaft? if youre that concerned about it, have it cryo treated. it wont break. they rarely break. ive got several 4r100s behind gen 2s (800ft/lbs, truck weight 5400lbs) and have never broke an input.
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I understand you are the man when it comes to trans in these trucks. I have a question about forward drums. I keep breaking this drum in different locations. I spun a clutch through one, and when I built the trans the last time there was a crack where the intermideate shaft mates to the forward drum. Is there an updated piece or is the billet steel the only upgrade?
 
Gen1SVE said:
I understand you are the man when it comes to trans in these trucks. I have a question about forward drums. I keep breaking this drum in different locations. I spun a clutch through one, and when I built the trans the last time there was a crack where the intermideate shaft mates to the forward drum. Is there an updated piece or is the billet steel the only upgrade?
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the billet drum is very expensive and unnecessary imo. use an e4od 4 plate drum. (not a 4r100 drum.) this will have a full depth spline. also have it cryo-treated. this usually keeps the ring land from blowing off and also makes the drum stronger overall.
 
badpony93 said:
i meant the rev limiter, and why would you want lift to 50% throttle going down the track? bouncing off the limiter for 300 feet will go faster than lifting and getting it into OD. what size tire are you running?
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I am bouncing off the limiter on a stock size tire.
 
Gen1SVE said:
I am guessing 3.73 for stock size tires and 3.55 for smaller slicks?
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yep thats what I was doing!! I have a few sets(gears) left over from my stangs and I just played with it till I found which was best. For my truck the 30"(315/65/15 M/T et street radial) and 3.73s works the best.:thumbup:


no reprogram needed. speedo may be off for tire size but not the gear ratio. so like 1-3mph
 
turbodgumby said:
yep thats what I was doing!! I have a few sets(gears) left over from my stangs and I just played with it till I found which was best. For my truck the 30"(315/65/15 M/T et street radial) and 3.73s works the best.:thumbup:


no reprogram needed. speedo may be off for tire size but not the gear ratio. so like 1-3mph
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Thanks Gumby!!! A set of gears and tires perhaps I can be in the 10's also. I know I have enough turbo. :blink:
 
Pics of the updated exhaust... When I built the kit I kept the borla cat back exhaust as the truck was due for inspection. After I got it through inspection I built a 4" exhaust to the rear. I used a 4" magnaflow muffler and gutted an aeroturbine muffler that was sitting around. I did not like the chamber in the muffler. I tried to keep it looking as sleeper as possible.
 
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