I have a question about my 4 speed Getrag from the '83 240D that's now behind my OM617. Everything works perfectly except it wants to grind going into reverse. Given that it's fine into first I don't think the clutch is dragging and it doesn't try to "pull" when stopped in gear with the clutch depressed. I realize that there are no synchros in reverse and maybe that's the issue.

My solution may be to start the engine with the trans in reverse when backing is needed but I wondered if anyone else has had this issue.

Thanks

Dan

Always? If you start with it in 1 and clutch then go into R without moving the vehicle it grinds?

Clutch is dragging.

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So far that seems to be the case. I only have a couple of driving events so I'll need to try some more scenarios to see what I get.

Thanks again

Dan

did you give it time to stop spinning?

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Put it in a forward gear first, then w/o the vehicle rolling, go to reverse.
This will stop the gear from turning,

I don`t believe reverse has a synchro.

Charlie

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definitely no synchro in reverse (originally I said first but meant reverse). It is rare for transmissions to have it in first I believe but I am pretty sure my big dodge has it.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Actually, in cars made in the past 20-30 years, I think synchronized first gear has become pretty much the standard.

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I meant to say reverse.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Rats! I'm still not "Smarter than a T Walgamuth."

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"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes

1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."

Thanks but you prolly are!

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Maybe Tom - but us old guys get crafty (age and guile beat youth and ability). And we're still at it!

Dan

This transmission should have four synchronizer rings.

x2
A1152623034

x2
A1152622934

All too often, the reverse issue is exacerbated by incorrect fit between pilot bearing and input shaft.
This puts excess force = shifting the input shaft to the rear = causing side binding on the gear line.

.

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I suspect Mr. Hunter may be close to the truth. I had a hard time getting the pilot bearing in there (remember, there is a 1mm difference which I did my best to rectify) but it did go in pretty snugly. Hard to know how much snug is the factory tight fit and how much is too tight. If that proves to be the issue I think I'll just have one turned in bronze. Next winter! I can run it like it is for this season.

And thanks for your input!

Dan

Install a proper pilot bearing now otherwise you will be changing the pilot bearing _AND_ transmission later. With a clutch dragging that badly, you will wear out syncros and shifter forks.

Make sure the flywheel and pressure plate are flat, is one is cupped the clutch will drag as will gummy input shaft splines.

Also, if you have done a mish mash of parts, you might not be getting enough pressure plate release.

My 1984 Ford Bronco 2 has syncro reverse. ( Mazda transmission ) as does my 88 and 99 Ranger ( also Mazda trans but different model )