TPI-Formula350-

what gear oil/weight are you drag guys running in your rears? synthetic? my car is mostly street but I'm rough on it .

91_B4C_RS

Ford 9" 4.11 gears and a spool. 80w90 cheap advance auto brand gear oil. Some gear companies suggest straight up dinosaur oil

jbenge

iTrader: (2)

80W90 Valvoline dino oil here. I've heard of synthetic gear lube being blamed for ring/pinion gear failures in drag race appications. I'm not sure its ever been proven but I'm not taking a chance on it.

mw66nova

iTrader: (13)

75w90 MasterPro synthetic from O'Reilly for my car.

the guys that really get into it use lightweight redline oil (not sure what weight) but it doesn't stay cool enough (too light) for street driving. i wouldn't go lighter than a 75w90 for the street, probably heavier for certain posi's (i don't know much about them other than one eaton i used many years ago)

TPI-Formula350-

anyone like 75w140?

GTA matt

iTrader: (1)

I put 50k miles on a rear with redline heavy shockproof gear oil with no ill affects. I really like that stuff. Tried the light weight shockproof oil and made exactly one pass with it before the brand new ring gear broke...

mw66nova

iTrader: (13)

^^^that probably had a lot more to do with the 7.5" ring gear diameter than the lightweight redline oil

GTA matt

iTrader: (1)

I just wanted to try it to see if there were any gains. No data was collected

For the record, I was getting 20 passes out of the heavy oil.

Tony V

iTrader: (5)

I've got the same set up. Switched out the cheap stuff with synthetic.

It leaks now.

Switching back...

AlkyIROC

I've got a spool in mine so I don't need any additives. 75W90 Lucas synthetic in mine.

DIGGLER

iTrader: (1)

been running synthetic royal purple 75/90. havent had any probs.

Shagwell

whatever I had laying around that day...........seriously, lol.

xpndbl3

iTrader: (5)

cheapest house brand 75w90 I can buy in a gallon or 5 gallon bucket and use for all the race cars.

DIGGLER

iTrader: (1)

my initial cost was a good bit, but ive been reusing mine. been dumped and re-installed 4-5 times now. good to see there is other cheapazzes on here. lol

mw66nova

iTrader: (13)

We own and race thirdgens, we are already the epitome of cheapazzes!

xpndbl3

iTrader: (5)

oh no if i was doing this for a "budget" I'd be racing a notch fox body like 99% of the rest of the world

DIGGLER

iTrader: (1)

amen to that. who wants to take the easy route to being like the jones's? i like seeing all the different cars popping up recently in x275 and whatnot. makes watching much more interesting!

Shagwell

I've re-used my head gaskets more times than that.........

AlkyIROC

I run MLS head gaskets. Give them a shot of brake clean to clean them up. Spray them with a copper spray and put them back on the block. I'm not sure how many times I have this set off and on.

Same with the diff oil. Drain it out into a clean container. If it looks clean, pour it back in and reuse it. I've reused my tranny oil a few times also. Doesn't smell burnt, still looks clean, pour it back in.

Engine oil is about the only thing I dump out after it's gone through the engine. Too much alcohol and moisture contamination to say it good to reuse.

Shagwell

Agreed.

I clean the hg's the same way, but we spray them with a silver spray-paint before installing. Seems to give them a sort of "hi-tack". - We've actually done the same with composition head gaskets for many years on lesser apps & re-used them any time they weren't torn. Never had one leak.