Crash/Smash Box??
Thread Starter
Member
iTrader: (1)
Joined: Sep 2001
Posts: 185
Likes: 0
From: S Jersey
Car: 88 Iroc
Engine: LB9
Transmission: WC T-5
Crash/Smash Box??
My friend was telling me that i could get this thing that made you only use the clutch for 1st gear, then after that you can just pull it out of gear and put in a new gear w/o using the clutch. Has anyone heard of this and if so where could you get one.
Ive never hear of one before,but even if they do make it why would you even want it??It more than likely cost an arm and a leg for it just so you dont have to push a cluch in, theres so many other places you could put that money in your car at.
Senior Member
Joined: Oct 2000
Posts: 659
Likes: 0
From: Chesapeake, VA
Car: '86 TransAm WS6
Engine: 305 TPI
Transmission: Custom TH700R4
What you're talking about is not an add-on to an existing transmission, but a tranny designed specifically for that.
In the old days, heavy duty manual transmissions had straight cut gears, and no synchro's, necessitating manuvers like the 'double-clutch' in order to properly execute a smooth shift. If you were in a hurry, you just slammed the lever in the the chosen gear, and force the gearsets to mesh. My 1969 International LoadStar 1600 had transmission like this. It was a 5 speed about the size of my desk, with a 3-foot shift lever. I tried the 'crashbox' move once, and the lever snapped back and nearly threw me out of the cab. Defienitely not for rookies.
These days there are a couple of ways to go clutchless.
For drag racing, there is the Lenco transmission, and maybe something from Jericho.
Road racers have been in to clutchless shifting for a while now, using dog-clutch sequential transmissions. Push the lever forward for a higher gear, pull it back for a lower one. To downshift two gears, pull back twice.
To sum up: Cluchless manuals do exist, but they are probably too expensive / hard core for street use. Race Only, please.
'Crash Boxes' refers to the old school, straight-cut transmissions. They are a very cool, hard-on muscle car part, but are expensive and tough to use. You could go through a couple of T-5s for what a Jericho costs.
Unless you drive something like the 'GeeTeeO Tiger'
Hope this clears it up.......
In the old days, heavy duty manual transmissions had straight cut gears, and no synchro's, necessitating manuvers like the 'double-clutch' in order to properly execute a smooth shift. If you were in a hurry, you just slammed the lever in the the chosen gear, and force the gearsets to mesh. My 1969 International LoadStar 1600 had transmission like this. It was a 5 speed about the size of my desk, with a 3-foot shift lever. I tried the 'crashbox' move once, and the lever snapped back and nearly threw me out of the cab. Defienitely not for rookies.
These days there are a couple of ways to go clutchless.
For drag racing, there is the Lenco transmission, and maybe something from Jericho.
Road racers have been in to clutchless shifting for a while now, using dog-clutch sequential transmissions. Push the lever forward for a higher gear, pull it back for a lower one. To downshift two gears, pull back twice.
To sum up: Cluchless manuals do exist, but they are probably too expensive / hard core for street use. Race Only, please.
'Crash Boxes' refers to the old school, straight-cut transmissions. They are a very cool, hard-on muscle car part, but are expensive and tough to use. You could go through a couple of T-5s for what a Jericho costs.
Unless you drive something like the 'GeeTeeO Tiger'
Hope this clears it up.......
Originally posted by SpeedCat86
What you're talking about is not an add-on to an existing transmission, but a tranny designed specifically for that.
What you're talking about is not an add-on to an existing transmission, but a tranny designed specifically for that.
OK a crash box is exactly that! Last time I saw one of these it was a muncie 4 spd but many a Borg Warner T10 had this mod. What happens is the syncronizer brass gets removed and toothed rings get welded to the gear in its place. Then a specialy made slider slips over/between the teeth when you shift. The best description is a motorcycle trans in operation. Crash box was best used with a break of torque to shift (decel or accel), but I have seen electric triggers that kill the engine for a split second. The advantage is no matter what RPM you dont have to wait on the brass syncro rings to change speed. Got pics of these old trans still. You could still get these things in the late 80's, not sure now?
Senior Member
Joined: Oct 2000
Posts: 659
Likes: 0
From: Chesapeake, VA
Car: '86 TransAm WS6
Engine: 305 TPI
Transmission: Custom TH700R4
Learn sump'n new every day.......
Blown 85: I always heard of those as 'dog clutches,' hence the confusion. I think that's how the modern sequential boxes work.
The guys at the Heavy Fleet Supply place called the old non-sychro truck transmisions 'crash boxes' so that's what I thought it meant.
Blown 85: I always heard of those as 'dog clutches,' hence the confusion. I think that's how the modern sequential boxes work.
The guys at the Heavy Fleet Supply place called the old non-sychro truck transmisions 'crash boxes' so that's what I thought it meant.
Sounds like a "clutch-turbo"; an automatic transmission with a clutch in place of the converter. Use the clutch to engage initially and then shift it like any other automatic.A good concept actually, surprised it hasn't caught on more.
Trending Topics
clutch auto's never caught on because they shift to hard on the street. It's like driving aLenco everyday :P. They were pretty popular in the late 80's. I believe Fairbanks used to make the kits for all commonly used autos.
Thread
Thread Starter
Forum
Replies
Last Post





