MG Sports Cars

engine swaps and other performance upgrades, plus "factory" and Costello V8s

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1979 MGB
Dennis Williams

(7 posts)

Registered:
05/06/2019 06:08PM

Main British Car:


LT77 Transmission
Posted by: 1979 MGB
Date: May 06, 2019 06:22PM

Hard to explain but when I put the mg up last year the shifter seamed loose. Left it alone till today. Something seems tight. Clutch is fine. Shifts ok. Something going on. I am not a mechanic.. I need to take it some where. My problem is to whom to take it. I feel if I drive it to far something bad could happen. Sorry I can't explain it more clearly. I live close to Cincinnati.


1979 MGB
Dennis Williams

(7 posts)

Registered:
05/06/2019 06:08PM

Main British Car:


Re: LT77 Transmission
Posted by: 1979 MGB
Date: May 07, 2019 07:39AM

Now iím starting to think that it could be a Ford 8Ērear end. I know when I used to get on it I would feel something in the driveshaft. I know when I change the rear end the driveshaft seem to be a little short but it still worked.


1979 MGB
Dennis Williams

(7 posts)

Registered:
05/06/2019 06:08PM

Main British Car:


Re: LT77 Transmission
Posted by: 1979 MGB
Date: May 07, 2019 08:30AM

OK I went out jacked up the car and when I spun the passenger wheel the drivers wheel stayed still and I went over and spun the drivers wheel and a passenger started to go to same time then I went back and spun the passenger side and the driver side started spinning it is a posi traction. The thing is it was making a growling noise.



Edited 1 time(s). Last edit at 05/07/2019 08:34AM by 1979 MGB.


kstevusa
kelly stevenson
Southern Middle Tennessee
(924 posts)

Registered:
10/25/2007 09:37AM

Main British Car:
2003 Jaguar XK8 Coupe 4.2L DOHC/ VVT / 6sp. AT

authors avatar
Re: LT77 Transmission
Posted by: kstevusa
Date: May 07, 2019 08:48AM

Dennis, if it is a *'8" Ford, almost any "Old School" shop should be able to do repairs. Maybe an axle brg on 1 side or perhaps a carrier bearing. Next is Pinion bearings. Each axle has a bearing and each side of carrier has a bearing. The pinion has a bearing on each end. If you are sure the problem is at rear, should be more easily repaired than the Tranny. If carrier has to come out, might consider replacing the Trac Loc clutch plates for the limited slip. Extra cost should only be parts.


ex-tyke
Graham Creswick
Chatham, Ontario, Canada
(1078 posts)

Registered:
10/25/2007 11:17AM

Main British Car:
1976 MGB Ford 302

authors avatar
Re: LT77 Transmission
Posted by: ex-tyke
Date: May 07, 2019 09:10AM

....and don't forget a small bottle of friction modifier to feed those clutch plates!


1979 MGB
Dennis Williams

(7 posts)

Registered:
05/06/2019 06:08PM

Main British Car:


Re: LT77 Transmission
Posted by: 1979 MGB
Date: May 07, 2019 09:59AM

Kelly Iím pretty sure thatís what was making a noise when Iím driving it is the rear end since I jack it up and got to hear it. I won the rear end on eBay for one dollar and I put all new parts in it and Iím pretty sure it did have the Limited slip and also I did add the modifier when It was put together . When I got this only had to cut off a couple inches at Moser. How Much modifier do I add how many ounces.



Edited 1 time(s). Last edit at 05/07/2019 10:01AM by 1979 MGB.


kstevusa
kelly stevenson
Southern Middle Tennessee
(924 posts)

Registered:
10/25/2007 09:37AM

Main British Car:
2003 Jaguar XK8 Coupe 4.2L DOHC/ VVT / 6sp. AT

authors avatar
Re: LT77 Transmission
Posted by: kstevusa
Date: May 07, 2019 11:14AM

Grab each rear wheel/axle with rear off the ground, try to wiggle side to side or top to bottom. should be no in-out or side to side movement. determine which side makes the noise. If neither side, next is internal in the chunk. Axles must come out to R&R the chunk, but then all the internal bearings can be examined.
Sometimes one can elevate the entire rear end and put car in gear to allow the wheels to turn, while another person listens to determine if either side or the noise is from the dif. Be careful to place jack stands under the housing or pinch welds. Let us know?



ex-tyke
Graham Creswick
Chatham, Ontario, Canada
(1078 posts)

Registered:
10/25/2007 11:17AM

Main British Car:
1976 MGB Ford 302

authors avatar
Re: LT77 Transmission
Posted by: ex-tyke
Date: May 07, 2019 11:19AM

Ford sells a small bottle (somewhere around 4 oz) - add completely to the diff oil.


1979 MGB
Dennis Williams

(7 posts)

Registered:
05/06/2019 06:08PM

Main British Car:


Re: LT77 Transmission
Posted by: 1979 MGB
Date: May 08, 2019 12:10PM

Thank you Graham. Found a place to take the car Iíll let you all know the ending.


1979 MGB
Dennis Williams

(7 posts)

Registered:
05/06/2019 06:08PM

Main British Car:


Re: LT77 Transmission
Posted by: 1979 MGB
Date: May 09, 2019 06:56AM

The more I dig into this and read what could be making the noise could it be the u-joints that have gone bad.
Only time I ever had a joint go bad was in my truck years ago and the drive shaft fell off. The first thing Iím gonna have them do is check the joint.


1979 MGB
Dennis Williams

(7 posts)

Registered:
05/06/2019 06:08PM

Main British Car:


Re: LT77 Transmission
Posted by: 1979 MGB
Date: May 11, 2019 03:19PM

Oops youíre not gonna believe this. The tailpiece shifter attached to the transmissions by two bolts and rubber bushings, those rubber bushings were wore out and the tail piece was bowing down hitting the driveshaft. Thatís what was making the shifter jump all around and that horrible noise. They make nylon bushings for that now which I will get. Iím just shocked that the shifter is that close to the driveshaft. In the meantime I was able to slide a couple of metal shims on top of the transmission up to the tail piece and kind a held in place and went out for a ride. But it also gave me a chance to drain the transmission and refill it. Now comes all those other things I need to do like a new top and fix the turn signalís and other odds and ends. Unbelievable.


kstevusa
kelly stevenson
Southern Middle Tennessee
(924 posts)

Registered:
10/25/2007 09:37AM

Main British Car:
2003 Jaguar XK8 Coupe 4.2L DOHC/ VVT / 6sp. AT

authors avatar
Re: LT77 Transmission
Posted by: kstevusa
Date: May 11, 2019 04:02PM

Good News! Not too bad after all. See you in Wytheville? It not close as Dayton, but not to difficult to get to. :-)


RMO 699F
Mike Maloney
SW Ohio
(522 posts)

Registered:
12/09/2007 12:28PM

Main British Car:
1974 MGB Sebring GT, 3.9 Rover V8

authors avatar
Re: LT77 Transmission
Posted by: RMO 699F
Date: May 11, 2019 05:57PM

Good news Dennis....are you still in the Hamilton area? Perhaps we could travel down to Wytheville together..


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