Rear end additive
#1
#5
Originally Posted by flaresidejay
You only need the friction modifier if you have limited slip
#6
#7
If you have the 5.4 engine, you have the 9.75" rear. The 4.6 and 4.2 are mated to the 8.8" rear.
And why do people keep getting so confused about the 'additive'? If you have a LS rear, just buy the gear lube labeled for a limited slip rear, it ALREADY HAS THE ADDITIVE IN IT! No need to 'add' anything! Just read the flippin' label, it's real easy. I've owned and been inside more than one LS rear axle, and I've never yet needed to buy or use any additive. If it's an LS rear, I buy the gear lube specified for LS. If it's an open rear, I buy the regular gear lube. Done deal.
And why do people keep getting so confused about the 'additive'? If you have a LS rear, just buy the gear lube labeled for a limited slip rear, it ALREADY HAS THE ADDITIVE IN IT! No need to 'add' anything! Just read the flippin' label, it's real easy. I've owned and been inside more than one LS rear axle, and I've never yet needed to buy or use any additive. If it's an LS rear, I buy the gear lube specified for LS. If it's an open rear, I buy the regular gear lube. Done deal.
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#8
Originally Posted by RockyJSquirrel
If you have the 5.4 engine, you have the 9.75" rear. The 4.6 and 4.2 are mated to the 8.8" rear.
And why do people keep getting so confused about the 'additive'? If you have a LS rear, just buy the gear lube labeled for a limited slip rear, it ALREADY HAS THE ADDITIVE IN IT! No need to 'add' anything! Just read the flippin' label, it's real easy. I've owned and been inside more than one LS rear axle, and I've never yet needed to buy or use any additive. If it's an LS rear, I buy the gear lube specified for LS. If it's an open rear, I buy the regular gear lube. Done deal.
And why do people keep getting so confused about the 'additive'? If you have a LS rear, just buy the gear lube labeled for a limited slip rear, it ALREADY HAS THE ADDITIVE IN IT! No need to 'add' anything! Just read the flippin' label, it's real easy. I've owned and been inside more than one LS rear axle, and I've never yet needed to buy or use any additive. If it's an LS rear, I buy the gear lube specified for LS. If it's an open rear, I buy the regular gear lube. Done deal.
Hey Rocky let me pull a rabbit out of my F150
I have the 5.4 so that means I have the 9.75 and the reason for asking the amount of "additive" to put is is the local part store only has the Gear Lube without the additive. So.... how much additive for the 9.75 will be needed? 4 oz or 8oz?
#10
how much additive for the 9.75 will be needed? 4 oz or 8oz?
I've added it right along with the Amsoil 75w140 lube I used a couple of times now and the LS has over 145,000 miles on it and it still grabs and works as it always has....
Mitch
#11
I've hear from many folks using Mobil 1 gear lube that no friction modifier is needed for ltd slips (no clutch chatter what so ever). Amsoil says the same thing, but I've found I get a little chatter with the Amsoil lube, so I use 4oz in my 9.75 pumpkin.
What ever you use...do NOT use RTV silicone gasket sealer. Make CERTAIN you use ULTRA GREY or ULTRA BLACK gasket maker. Synthetic oil will attack and break down RTV resulting in a leaky cover and a mess inside (nice coating of sticky RTV all all over the gears and bearings).
What ever you use...do NOT use RTV silicone gasket sealer. Make CERTAIN you use ULTRA GREY or ULTRA BLACK gasket maker. Synthetic oil will attack and break down RTV resulting in a leaky cover and a mess inside (nice coating of sticky RTV all all over the gears and bearings).
#12
Hey, guys, where do you find Mobil 1 75W140 ???? I have looked everywhere, O'Reilly's, Autozone, Advance, Napa, etc. They all have 75W90 ... but no 75W140 which is what my 9.75 calls for. I'm beginning to wonder if this stuff really exists. Mobil 1 website shows it is one of their products, but they don't help you get any. I'm ready to change rear end fluid, but can't find Mobil 1 75W140.
#13
Originally Posted by Night Runner
Hey Rocky let me pull a rabbit out of my F150
I have the 5.4 so that means I have the 9.75 and the reason for asking the amount of "additive" to put is is the local part store only has the Gear Lube without the additive. So.... how much additive for the 9.75 will be needed? 4 oz or 8oz?
I have the 5.4 so that means I have the 9.75 and the reason for asking the amount of "additive" to put is is the local part store only has the Gear Lube without the additive. So.... how much additive for the 9.75 will be needed? 4 oz or 8oz?
#14
Originally Posted by Norm
If you do not have limited slip, you do not need the additive. Save your money. If you do they say use 4 oz. (1 oz per quart) If it slips or chatters add another 4.
I have to replace the Differential Gasket/silicon as it is leaking. I know I have a H9 axel also my differential is a 3.55 Limited Slip.
But Thanks for that info I need to use 2.5 Quarts of fluid so it looks like I need 4 oz additive.
Also I looked for the Moble 1 and like another post can not find it. O'Rielly's and Wally World (Wal-Mart) do carry the 75W140. O'Reilly's also carries the additive but not Wally World
Last edited by Night Runner; 07-28-2005 at 01:33 PM.