T98 oil type and amount?
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Tuned
Joined: Sep 2017
Posts: 385
Likes: 29
From: Pinckney Mi.
T98 oil type and amount?
So it time to fill it,want to fill it b4 I bolt the top on.
I really want to use synthetic but worried a bite aboot sycros, they are brass or bronze.
What say you men?
Greg
I really want to use synthetic but worried a bite aboot sycros, they are brass or bronze.
What say you men?
Greg
Cargo Master
Joined: Aug 2014
Posts: 2,594
Likes: 72
From: North Central Arkansas
I am running Mystic 85-140 in mine. I tried straight 90W, 140W and Pennzoil Syncromesh oil, I think it was 75-90. I had shifting problems with all of them, with Pennzoil being the worst. The transmission would grind going into 3rd and 4th when the transmission was hot. The Mystic oil helped. I changed transmission for a low mileage T98 from a fire truck and now I only have an occasional issue when shifting into 4th. I am shifting at 3800-4000rpms which is probably not helping the problem. A multiweight oil with an MT-1 rating in addition to the GL rating will be safe for the yellow metals.
Mark
Mark
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Tuned
Joined: Sep 2017
Posts: 385
Likes: 29
From: Pinckney Mi.
Thanks guys,anybody know how much a T98 will hold? seems like looking into from top there is room for at least a gallon?
It seems i need a G4 type oil, do you folks agree?
thanks again
Greg
It seems i need a G4 type oil, do you folks agree?
thanks again
Greg
Fleet Mechanic
Joined: Sep 2018
Posts: 1,543
Likes: 539
Reviving this thread.
Getting ready to fill my transmission today to tomorrow. On my Camaro you fill it until it overflows out of the plug in the side. Same procedure here or is there another way to fill it?
The transmission is not in the truck yet and there is no shifter connected. I read you can fill it through the shifter hole?
I was planning to use something like Lucas 80w-90 GL5 yellow metal safe oil and some Lucas heavy duty oil stabilizer. The guy who rebuilt my rear on my Camaro and is a drag racer highly recommends adding it to gear boxes.
Thanks!
Getting ready to fill my transmission today to tomorrow. On my Camaro you fill it until it overflows out of the plug in the side. Same procedure here or is there another way to fill it?
The transmission is not in the truck yet and there is no shifter connected. I read you can fill it through the shifter hole?
I was planning to use something like Lucas 80w-90 GL5 yellow metal safe oil and some Lucas heavy duty oil stabilizer. The guy who rebuilt my rear on my Camaro and is a drag racer highly recommends adding it to gear boxes.
Thanks!
Parts Nerd Extraordinaire
Joined: Sep 2010
Posts: 4,396
Likes: 1,801
From: Western NY
Yup, fill it until the fill plug overflows. You can fill the case from any access.
The book calls for SAE 140 in the summer, SAE 90 in the winter. This would be a GL-1with without EP (extreme pressure) additives.
Today, I believe some use an 80W-90, Yellow Metal safe GL-5 but I tend to sick with the original spec if able.
The book calls for SAE 140 in the summer, SAE 90 in the winter. This would be a GL-1
Today, I believe some use an 80W-90, Yellow Metal safe GL-5 but I tend to sick with the original spec if able.
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Fleet Owner
Joined: Jul 2004
Posts: 27,304
Likes: 1,062
From: NM
GL-1 by definition doesn't contain any EP additives. I believe only GL-4 and GL-5 have them. I doubt a T98 needs EP but it can't hurt as long as it is yellow metal safe.
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