Shifted from drive to reverse without braking

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bkbenjy

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I shifted from drive to reverse with my foot pressing down 80% on the brake. There was a knock sound I think.

After that I shifted back and forth between drive and reverse properly to make sure everything is okay. It is.

Did I harm my transmission?
 
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It's very bad idea to shift to reverse while the car is moving forward, only shift to reverse when the car is completely stopped. The same for shift out of reverse, only when the car is completely stopped.
 
Originally Posted By: HTSS_TR
It's very bad idea to shift to reverse while the car is moving forward, only shift to reverse when the car is completely stopped. The same for shift out of reverse, only when the car is completely stopped.


I know its a bad idea, I made a mistake. The car was completly stopped
 
Today when shifting out of reverse, I accidentally didn't put it in drive, it was in neutral.... I hit the gas and then without thinking I put my hand on the gearlever.... CHUNK, car moves forward, but it kind of chugs, and doesn't respond to throttle input for about 4 seconds, missing and chugging, before it recovers and continues on. It isn't displaying any signs of damage so I'm not concerned about it.. Just kicking myself in the head for doing it.
 
Just to test the turbo400 trans in the old 70 buick 455, we used to throw it in reverse at 50 MPH going forward and floor it when it engaged doing a "burnout stop". Never hurt the car - but that was one beefy transmission! We were Crazy Kids in the 70's!
 
Originally Posted By: bkbenjy
I shifted from drive to reverse with my foot pressing down 80% on the brake. There was a knock sound I think.

After that I shifted back and forth between drive and reverse properly to make sure everything is okay. It is.

Did I harm my transmission?
How fast forward were you traveling? I assume this is an automatic, since MOST trans dont have reverse synchromesh.
 
NO vehicle I've owned has had a synchromesh reverse with blockers ex. maybe the 98 BMW M roadster. I am unaware of any economy car or mid level car with a synchromesh reverse with blockers. You'll spit the case in half if you engage reverse whilst moving fwd at say 5mph.
 
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Originally Posted By: ARCOgraphite
Just to test the turbo400 trans in the old 70 buick 455, we used to throw it in reverse at 50 MPH going forward and floor it when it engaged doing a "burnout stop". Never hurt the car - but that was one beefy transmission! We were Crazy Kids in the 70's!


They don't build them like they used to. If I tried that on any of the cars I own or owned, I'm sure it would have broke!
 
Originally Posted By: ARCOgraphite
Originally Posted By: bkbenjy
I shifted from drive to reverse with my foot pressing down 80% on the brake. There was a knock sound I think.

After that I shifted back and forth between drive and reverse properly to make sure everything is okay. It is.

Did I harm my transmission?
How fast forward were you traveling? I assume this is an automatic, since MOST trans dont have reverse synchromesh.


Turbo 400 were the same transmissions they put in 1 ton trucks and buses, as well as Rolls Royce vehicles for a time. They were also in a lot of Muscle cars in the 60s and 70s.

I never knew they were put in the Rolls until I saw it on the application chart for a filter I was putting in my car. I was shocked....... They used to be the strongest automatic trans GM made. I think they still are for all out racing. But that might have changed.
 
Strong trans but eat up HP and torque - TH350 modded are the 3 speed of choice in a small block high RPM motor, but 2speed powerglides for Big Blocks. You Dodge boys I give props to the 727 and Ford the C6 - all stout trans in the day!
 
My 89 1 ton has a TH-400. There was actually a TH-475 that was used in Buses and some Motor Homes. My old Fleetwood had one. The only way to tell the difference was the parking brake on the tail shaft (if memory serves me correctly). The main difference was the planetary gears and how they were cut.
The TH-475 had the stronger gears.
The 4L80E is basically an overdrive version of the TH-400.
 
Does anyone know what transmission would be bechind the Olds 304 small block in the 1978 Oldsmobile Regency 88? We used to have one of those years ago, and it went through a few transmissions over the years.
 
Originally Posted By: ARCOgraphite
I am unaware of any economy car or mid level car with a synchromesh reverse with blockers.


Ford Contour, Mercury Mystique, most likely the Ford Focus too, all have a synchromesh reverse. (I believe the Ford Focus uses the same MTX-75 manual transmission that the Contour does).
 
Originally Posted By: Ryan
Originally Posted By: ARCOgraphite
Just to test the turbo400 trans in the old 70 buick 455, we used to throw it in reverse at 50 MPH going forward and floor it when it engaged doing a "burnout stop". Never hurt the car - but that was one beefy transmission! We were Crazy Kids in the 70's!


They don't build them like they used to. If I tried that on any of the cars I own or owned, I'm sure it would have broke!

Mythbuster tried this on a mid 90s Crown Vic and the PCM cut the engine when it was put into reverse at speed. I assume any other modern car would do the same.
 
Originally Posted By: rudolphna
Does anyone know what transmission would be bechind the Olds 304 small block in the 1978 Oldsmobile Regency 88? We used to have one of those years ago, and it went through a few transmissions over the years.


GM put out a light duty TH-250 that was really designed for 4 cyl and small V6s in the late 70s that was not meant to be bolted up to a V8. They failed very early.
 
Originally Posted By: brianl703
Originally Posted By: ARCOgraphite
I am unaware of any economy car or mid level car with a synchromesh reverse with blockers.


Ford Contour, Mercury Mystique, most likely the Ford Focus too, all have a synchromesh reverse. (I believe the Ford Focus uses the same MTX-75 manual transmission that the Contour does).


It probably has something to do with the layout of the transmission and how the gears are used. If it's showing up in economy cars, then it probably costs close to nothing to incorporate in those transmissions.
 
I used to have a 1969 Torana with 138 c.i. six and 3 speed column shift auto (Trimatic).

More than twice, I dropped back to second, then when bumping back to drive overshot the gate and ended up in reverse. Lights on dashboard as the engine stalled/ran backwards, and not much else.

Brother had an HK Premier with 307 and powerglide, and his (not long to be) GF bashed it into reverse at 80mph. skidded to a halt, and the powerglide dies over the next couple thousand km.

As to the turbo400, one of my fave holden adds was them testing the autos in the sandpit. full throttle, forward, reverse, forward, reverse.
 
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