Three monyhs or so I changed both differentials and transfer case fluids. I just discovered the rear is leaking, I used Permatex Ultra Black and waited at least 1.5 hours before refilling. I had checked several times after and saw no fluid until recently.
Considering the cost of the Synthetic 75W140 I would really like this next change to last a while.
I searched for a gasket before last change but could not locate one for the twelve bolt rear
3.55LS.
As always any help will be greatly appreciated!

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97 F-150 XLT Ext.cab
5.4 auto o/d, 3.55 LS
Elct. 4x4, Tow Pkg.
Capt. Chairs, Console
Two Tone paint,Black on Silver
Ford Bed Liner,Soft Tonneau
Bug sheild
Sony xplode CDX-600,MTX 325watt amp, 2 10" JBL subs.
Stock and Love It

 

Use some Loctite gasket maker. I think the number is 517. Hands down, best stuff on the market. Or better yet, get yourself a Mag-Hytec differential cover and you won't have to worry about any sealant. www.mag-hytec.com And while your at it do yourself a favor and switch that runny 75w140 to some Lubrication Engineers 607 gear lube. www.le-inc.com Again, hands down, best stuff on the market. But, only if you want your differentials to last longer.

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98 F-150 XLT 4X4 ORP Super Cab Short Bed, 4.6, Auto, 4.10's, Mag-Hytec diff. cover, Magnacharger supercharger, K&N FIPK, Superchip, Gibson single cat-back, 80/100w German head lamps, 80w amber fog lamps, Warn HS9500i winch with semi hidden mount, Wrangler dual battery kit with red & yellow top Optima batteries, 285/75R16 Goodyear MT/R's, 16x8 Center Line Hell Cats (JUNK WHEELS), Rancho RSX shocks, B&M deep aluminum trans pan, Rhino bedliner. Needs one more door.
http://hometown.aol.com/ninetyeightfword

 

If you get a chance, try the Loctite instead.

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98 F-150 XLT 4X4 ORP Super Cab Short Bed, 4.6, Auto, 4.10's, Mag-Hytec diff. cover, Magnacharger supercharger, K&N FIPK, Superchip, Gibson single cat-back, 80/100w German head lamps, 80w amber fog lamps, Warn HS9500i winch with semi hidden mount, Wrangler dual battery kit with red & yellow top Optima batteries, 285/75R16 Goodyear MT/R's, 16x8 Center Line Hell Cats (JUNK WHEELS), Rancho RSX shocks, B&M deep aluminum trans pan, Rhino bedliner. Needs one more door.
http://hometown.aol.com/ninetyeightfword

 

oops- mental typo!
anyway I made a few calls about roll gasket material, I was going to scan my pan and laser cut my own at work but got to talking and found I may have a heavy duty rear axle and found a part listed for the F-250 12 bolt. I Think I'll check that for a fit before cutting one.
Thanks again!

[This message has been edited by CDeHeer97 (edited 05-02-2001).]

[This message has been edited by CDeHeer97 (edited 05-03-2001).]

 

I've had mag-hytec bookmarked since I first changed fluid just havn't freed up the money -yet, The tranny pan looks sweet too, but once again the money. However I will try the leaktite for now and look into the gear lube.
Thanks for the input!