Best oil to use in TC back axle
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timandgerda
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Best oil to use in TC back axle
Hi all - I have a question regarding the oil to use in my TC back axle. I have had to install a Morris Minor van crown wheel and pinion (4.55:1) with the rest of the axle being original TC (this due to damage to my original axle found during restoration work). Should I be using 140 oil as per the manual or is EP90 more appropriate for the Morris parts? Any advice would be much appreciated. Cheers. Tim.
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Steve Simmons
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Re: Best oil to use in TC back axle
I would use the oil recommended for the Morris, since the gears are the critical item to lubricate properly.
Re: Best oil to use in TC back axle
Hi Tim.
You will need EP 80W/90 gear oil in the Morris Minor axle.
Incidentally, by using that ratio, you will notice a reduction in revs per gear compared with the original TC diff ...at the expense of slightly slower acceleration. It should, however, help extend the life of the XPAG engine.
You will need EP 80W/90 gear oil in the Morris Minor axle.
Incidentally, by using that ratio, you will notice a reduction in revs per gear compared with the original TC diff ...at the expense of slightly slower acceleration. It should, however, help extend the life of the XPAG engine.
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ROGER FURNEAUX
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Re: Best oil to use in TC back axle
hi Tim - you could have come to me for your diff. - I have every part! But your MM diff would have been cheaper, albeit non-original.
Roger
AKA "Mad Metrics"
Roger
AKA "Mad Metrics"
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timandgerda
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Re: Best oil to use in TC back axle
Thanks all
Steve - your thinking was the same as mine but nice to have a sanity check!
Ray - I went for the 4.55 ratio for that very reason. I chose the van version as the oil filler is similar to the TC arrangement i.e. at the front - I understand that cars had the filler in the rear cover plate but cant confirm this. In order to make the Morris unit fit (bring the half shafts into line) I had to machine a significant amount of material off the the flange. This being aluminium I was concerned about the strength so had a washer cut out of stainless steel to sit over this and sandwich the flange in position. Before I retired I had access to a water jet machine and this really helped!
Roger - I have been working on this project for some years now and at the time of the modification you were waiting for a new batch of parts. Rest assured that if my repair/modification is unsuccessful I will be making a trip to Cornwall!
Thanks again everyone for you kind assistance.
Cheers. Tim
Steve - your thinking was the same as mine but nice to have a sanity check!
Ray - I went for the 4.55 ratio for that very reason. I chose the van version as the oil filler is similar to the TC arrangement i.e. at the front - I understand that cars had the filler in the rear cover plate but cant confirm this. In order to make the Morris unit fit (bring the half shafts into line) I had to machine a significant amount of material off the the flange. This being aluminium I was concerned about the strength so had a washer cut out of stainless steel to sit over this and sandwich the flange in position. Before I retired I had access to a water jet machine and this really helped!
Roger - I have been working on this project for some years now and at the time of the modification you were waiting for a new batch of parts. Rest assured that if my repair/modification is unsuccessful I will be making a trip to Cornwall!
Thanks again everyone for you kind assistance.
Cheers. Tim
Re: Best oil to use in TC back axle
Ray-
Another way of looking at it is that with the 4.5:1 you will need to spin the engine faster to keep up with a factory equipped 5.125:1 around town and off the line.
Back in the day (and today) people used the 1/2 inch wider, and taller (30" overall dia.) Ford Model A tires on TC's. The A tires are as wide as you can go with stock rear fenders. If I recall the numbers, such a switch from smaller to larger diameter tires on a stock TC will accomplish the same thing as going to 4.5 or 4.6:1. Approximately a 400RPM drop at 60MPH. The overall dia. of your tires are an integral part of your gear set.
Another way of looking at it is that with the 4.5:1 you will need to spin the engine faster to keep up with a factory equipped 5.125:1 around town and off the line.
Back in the day (and today) people used the 1/2 inch wider, and taller (30" overall dia.) Ford Model A tires on TC's. The A tires are as wide as you can go with stock rear fenders. If I recall the numbers, such a switch from smaller to larger diameter tires on a stock TC will accomplish the same thing as going to 4.5 or 4.6:1. Approximately a 400RPM drop at 60MPH. The overall dia. of your tires are an integral part of your gear set.