3rd Gear Crunch!

[westojh]

Hello again!

I have another problem with my car! I have a Rev 1 mark 2 and 1st to 2nd was crunching, so I was advised to change it for a Rev 2 / 3 box as these have twin sincro's. I have done this and I have now adopted a 3rd gear crunch!!!

This only happens going down the box from 5th or 4th. If I ease the gear in its fine, but if I let it take its self in it crunches. It is also worse when the box is cold.

I have been advised by two garages to replace the cables, as these are prone to stretching, this is because the garages have never known a rev 2 / 3 box to crunch.

I just wanted to throw this one 'out there' and see what your advice / experience is....

Please !

Cheers

James

p.s. I have contacted the place I got the box from and they assued me the box was fine, as they drive it before I had it???!!!

[GIDDLEPIN]

Was the gearbox from a scrap yard or a proper gearbox overhaul centre?

If it was a scrap yard I'm afraid that is always the stock answer, "It was alright when it came in" yeah rrrright! . The only thing you could do in that case would be to show them the problem and see what they will do about it, if they have another gearbox in they will probably tell you they will swap it, if not they could say "we're not responsible because we didn't fit it"

If it was a reputable gearbox centre, just tell them the problem and they will sort something out.

Either way if it is the syncro's, It's going to have to come out again :(

Les

[westojh]

Was the gearbox from a scrap yard or a proper gearbox overhaul centre?

If it was a scrap yard I'm afraid that is always the stock answer, "It was alright when it came in" yeah rrrright! . The only thing you could do in that case would be to show them the problem and see what they will do about it, if they have another gearbox in they will probably tell you they will swap it, if not they could say "we're not responsible because we didn't fit it"

If it was a reputable gearbox centre, just tell them the problem and they will sort something out.

Either way if it is the syncro's, It's going to have to come out again :(

Les

←

Yeah from a scrappy! But the chap was quite good, offered to give me my money back etc, but he said he was amazed that it crunch cause he drove with it before I had it etc....

The MR 2 specialist where I had it fitted, was also amazed it was crunching! Have you had any experience with the cables stretching?

I'm not sure if I'm being sent up the garden path and all that!!!

[boundsw]

Im sure they can stretch, might be owrth changing them !

How mcuh is a gearbox overhaul, that might be a bit more cash, but would prob solve all ya problems for a few more miles !!

Changing gear, missing gears is not very favored with 'sports' cars

ie 5-3

4-2

try changing 5-4-3

I have a problem with mine, some times it wont, i mean wont go into 2nd a quick 3-4-3-4-3-4 all with the clutch down. then 2nd is a breeze...only happens now and again, just worn syncros i recon !

[westojh]

Im sure they can stretch, might be owrth changing them !

How mcuh is a gearbox overhaul, that might be a bit more cash, but would prob solve all ya problems for a few more miles !!

Changing gear, missing gears is not very favored with 'sports' cars

ie 5-3

4-2

try changing 5-4-3

I have a problem with mine, some times it wont, i mean wont go into 2nd a quick 3-4-3-4-3-4 all with the clutch down. then 2nd is a breeze...only happens now and again, just worn syncros i recon !

←

An overhaual is an option, but as you said, its more cash!

I've tried 5-4-3 and its just the same! Double-d-clutch doesn't help either! Nor bliping the throttle before changing! When I say that, it does kinda seem like its no the sincro's cause all that changes the geear spinning speed, so it should in theory have effect the change? Does that make sence?? I think I'm loosing my marbles??!!

[dawolf]

Why have the garages never known a rev 2/3 gearbox to crunch? It seems to be a fairly common occurence on MR2's as they become older and more worn. Mine has a crunch in 3rd gear, sounds just like yours actually. Mostly does it when changing down from 4th and when being more aggressive, if I do it gently it doesn't crunch so I'm thinking it may not be as serious as I first thought. It's been like this for about a year!

[KiwiMR2]

My Type III has a 5th gear crunch. Will be the syncro's.

Cheers

KiwiMR2

[Mick24]

The cable's have been known to stretch on the higher mileage vehicles but sounds more like a worn synchro hub(baulk rings/slipper pads).

:(

[westojh]

The cable's have been known to stretch on the higher mileage vehicles but sounds more like a worn synchro hub(baulk rings/slipper pads).

                                            :(

←

Cheers Guys!

I'll have to assess my monetry situ! Think It'll be a sincro change as you suggest!

Oh why can't these things be cheap?!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[Jimlad]

try changing your gbox oil to redline mt90 stuff... should make gear changes slightly easier.

Gbox rebuilds will be quite expensive!

[westojh]

try changing your gbox oil to redline mt90 stuff... should make gear changes slightly easier.

Gbox rebuilds will be quite expensive!

←

I've gone all out! I'm having the cables done on sat, so I'll see what happens! Fingers crossed!

Thanx for your advice! It will be my next step if this fails!!

Cheers

James

[TonyMde]

So I just joined and I have the same 3rd gear crunch issue. 4-3 2-3. I changed the oil to Mt90. Same problem but the shifting is definitely sweeter. I took the car for a 35 minute drive no improvement. If I shift below 29 mph no crunch. If I gently coax  it in,I sometimes may get lucky. I have resigned myself to the fact that its the synchro. I will try to live with it until a clutch change is due unless I get fed up and can’t take anymore. 

[Graham p]

Got same prob 1992 g-ltd 50 543 miles just drive it steady just done MOT no prod passed