TH400 question
02-14-2011, 02:14 AM
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TH400 question Ok, I have searched and can't seem to find an answer. Maybe someone will be able to help me out with this question...
In a TH400 that has a RMVB in it, Is it ok to manually shift back to say 1st gear or even second gear when driving. (like if I was already cruising at 40 mph and lined up next to someone to do a 1st gear pull on the street) Could I slow the car down, shift into 2nd gear, then into 1st gear and line up and race from whatever speed we are at in 1st gear? I heard that with a RMVB TH400 you are supposed to come to a complete stop before changing gears??? I personally thought it was BS when I heard it, but a few other people said they had heard that too. So I just wanted to ask someone in the Transmission field. Any help or insight would be greatly appreciated.
I have been back and forth with why it would be bad on the transmission and can't seem to come up with a logical reason behind someone saying this.
Please help me better understand why I can't do this or if it TRUELY is a BS Myth that someone made up.
Thank You!
-James
In a TH400 that has a RMVB in it, Is it ok to manually shift back to say 1st gear or even second gear when driving. (like if I was already cruising at 40 mph and lined up next to someone to do a 1st gear pull on the street) Could I slow the car down, shift into 2nd gear, then into 1st gear and line up and race from whatever speed we are at in 1st gear? I heard that with a RMVB TH400 you are supposed to come to a complete stop before changing gears??? I personally thought it was BS when I heard it, but a few other people said they had heard that too. So I just wanted to ask someone in the Transmission field. Any help or insight would be greatly appreciated.
I have been back and forth with why it would be bad on the transmission and can't seem to come up with a logical reason behind someone saying this.
Please help me better understand why I can't do this or if it TRUELY is a BS Myth that someone made up.
Thank You!
-James
02-14-2011, 07:39 AM
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You can, but you want to bring the rpms up before you downshift, least that's the way it was explained to me. Im still iffy about it so I personally don't do it. But some info for ya
02-14-2011, 12:33 PM
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Ok, cool man. Thank You.
I'm guessing it's b/c the trans doesn't have an engine brake built in... so by bringing the rpm's up it's not gonna shock the tranny as much??? I think I'm on to something, lol but correct me if I'm wrong.
When cruising with your foot on the gas it maintains rpm, when you let off the gas the rpms drop down and the trans is just free wheeling itself (like in nuetral) so by bringing the rpms back up when downshifting it's acts as normal transmissions do and doesn't shock the trans when you get back into the gas.... Thats what I think anyways!!!
I'm guessing it's b/c the trans doesn't have an engine brake built in... so by bringing the rpm's up it's not gonna shock the tranny as much??? I think I'm on to something, lol but correct me if I'm wrong.
When cruising with your foot on the gas it maintains rpm, when you let off the gas the rpms drop down and the trans is just free wheeling itself (like in nuetral) so by bringing the rpms back up when downshifting it's acts as normal transmissions do and doesn't shock the trans when you get back into the gas.... Thats what I think anyways!!!
02-14-2011, 01:03 PM
#4
Ok, cool man. Thank You.
I'm guessing it's b/c the trans doesn't have an engine brake built in... so by bringing the rpm's up it's not gonna shock the tranny as much??? I think I'm on to something, lol but correct me if I'm wrong.
When cruising with your foot on the gas it maintains rpm, when you let off the gas the rpms drop down and the trans is just free wheeling itself (like in nuetral) so by bringing the rpms back up when downshifting it's acts as normal transmissions do and doesn't shock the trans when you get back into the gas.... Thats what I think anyways!!!
I'm guessing it's b/c the trans doesn't have an engine brake built in... so by bringing the rpm's up it's not gonna shock the tranny as much??? I think I'm on to something, lol but correct me if I'm wrong.
When cruising with your foot on the gas it maintains rpm, when you let off the gas the rpms drop down and the trans is just free wheeling itself (like in nuetral) so by bringing the rpms back up when downshifting it's acts as normal transmissions do and doesn't shock the trans when you get back into the gas.... Thats what I think anyways!!!
The best method at speed is to very lightly accelerate (just enough for the sprag to be loaded after the downshift) then downshift.
02-14-2011, 07:18 PM
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Thanks man, I guess I kinda answered my own question then huh. lol
I appreciate the help, But was just very curious as to why it was said to not downshift while cruising.... Makes perfect sense tho, kinda like why you don't wanna throw it in Neutral at the end of the 1/4 mile b/c the internals can multiply to like 3x's the rpm's of the engine (ex. 7000 rpm then Nuetral = 21,000 rpms) Transmissions have been KNOWN to explode b/c of this.
Thanks guys!
-James
I appreciate the help, But was just very curious as to why it was said to not downshift while cruising.... Makes perfect sense tho, kinda like why you don't wanna throw it in Neutral at the end of the 1/4 mile b/c the internals can multiply to like 3x's the rpm's of the engine (ex. 7000 rpm then Nuetral = 21,000 rpms) Transmissions have been KNOWN to explode b/c of this.
Thanks guys! -James
