what is free-wheeling a TH400?
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If you use a reverse valve body pattern, it will not have engine braking in manual 2nd gear. I am not sure about manual 1st gear. This is not desirable for street use, and it can be dangerous. It also does not use the vacuum modulator, which is hard on the front pump, sealing rings, and it can have very hard shifts. Stick with the forward pattern which offers engine braking. Use the Trans-Go Performance Shift kit. When setup properly it can give you smooth part throttle shifts and firm WOT shifts.
I've used the transgo 1&2 kit and it's great for an automatic th400.
I now run a th400 with a turbo action reverse manual vb with no engine braking.
When I first set the trans up there was a guy on another site that burned up his intermediate sprag.
He would coast in first while going fast and apparently it allows the direct drum to free wheel so fast it slings the lube off the sprag. In stock form the band would clamp it and stop the drum.
I now run a th400 with a turbo action reverse manual vb with no engine braking.
When I first set the trans up there was a guy on another site that burned up his intermediate sprag.
He would coast in first while going fast and apparently it allows the direct drum to free wheel so fast it slings the lube off the sprag. In stock form the band would clamp it and stop the drum.
TECH Regular
Joined: Feb 2004
Posts: 439
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From: burbank ca
vb
Originally Posted by Pro Built Automatics
If you use a reverse valve body pattern, it will not have engine braking in manual 2nd gear. I am not sure about manual 1st gear. This is not desirable for street use, and it can be dangerous. It also does not use the vacuum modulator, which is hard on the front pump, sealing rings, and it can have very hard shifts. Stick with the forward pattern which offers engine braking. Use the Trans-Go Performance Shift kit. When setup properly it can give you smooth part throttle shifts and firm WOT shifts.
I just bought a TH400 with a reverse manual valve body. The car is street driven some, but mainly raced. Am I correct in understanding that as long as I don't coast in 2nd gear, I won't cause any damage to the tranny? If I come to a complete stop at lights in 3rd, and then shift to 1st, will I be alright?
Also, if I am cruising along at 35mph or so in 3rd, and want to pull it down to 2nd to pass or take off, I won't do the tranny any harm as long as I put it in 2nd and then put the power to it?? Just trying to understand exactly when the damage occurs. Thanks.
Also, if I am cruising along at 35mph or so in 3rd, and want to pull it down to 2nd to pass or take off, I won't do the tranny any harm as long as I put it in 2nd and then put the power to it?? Just trying to understand exactly when the damage occurs. Thanks.
Originally Posted by BLK02WS6
I just bought a TH400 with a reverse manual valve body. The car is street driven some, but mainly raced. Am I correct in understanding that as long as I don't coast in 2nd gear, I won't cause any damage to the tranny? If I come to a complete stop at lights in 3rd, and then shift to 1st, will I be alright?
Also, if I am cruising along at 35mph or so in 3rd, and want to pull it down to 2nd to pass or take off, I won't do the tranny any harm as long as I put it in 2nd and then put the power to it?? Just trying to understand exactly when the damage occurs. Thanks.
Also, if I am cruising along at 35mph or so in 3rd, and want to pull it down to 2nd to pass or take off, I won't do the tranny any harm as long as I put it in 2nd and then put the power to it?? Just trying to understand exactly when the damage occurs. Thanks.
if u have to wait till you shift it to give it power then that sucks *****.guess i am just totally missing something here. Trending Topics
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Joined: Feb 2004
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From: burbank ca
freewheeling
Originally Posted by redbandit98
i too am lost on this as well..i have heard with teh reverse vb you dont want to "freewheel" the tranny..they say 1st and second have no engine braking so if you shift from third to second it will be like neutral..so how in the hell do you like you said downshift to 2nd if your racing someone or want to pull it down to pass..if its like neutral then it will go nowhere or what? if u have to wait till you shift it to give it power then that sucks *****.guess i am just totally missing something here.
if u have to wait till you shift it to give it power then that sucks *****.guess i am just totally missing something here.LS1 Tech Stories
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Originally Posted by john kilgore
the turbo 400 and 350 have one-way clutches in first and second. that means if you down shift to second at, say 40mph, all you have to do is open the throttle until you lock the one way and off you go. the bands in the trans are for compression braking. the rear band is also for rev.
just couldnt grasp the concept of a tranny getting messed up from downshifting..so you can downshift all you want even at wot as long as youre at a reasonable speed and no harm will be done..the damage would occur if you were going 120 and slid it into 1st or second without any throttle and therfore the "freewheel" effect..am i correct?thanks man
2nd, 350, braking, breaking, coast, compression, engine, freewheeling, freewheels, manual, no, shifting, th400, transmission, turbo
