124 Spider (Classic) Newbie from Pgh PA

[Gman15116]

Hi All,

I just joined yesterday. I have a 1971 BS 1 spider with a 1608 motor, crane cams fireball XR700 ignition, electric fuel pump and Ansa exhaust. The car has 58k miles but has sat twice for 20 year periods. It runs, shifts and stops. I'm in the process of making is roadworthy. I replaced the gembo, drive shaft center bearing, and Ujoints. I'm replacing the front differential seal and will soon be refilling the differential fluid. I have many new rubber brake lines, hoses, fuses, brown line wire, headlight relay kit conversion, new air horn kit, etc... to work through. The steering is really stiff and groans. I believe that I may need to work on the Idler and/ or the steering box.

One question. What is the proper Differential oil to use in the rear end? (GL1-GL5, EP vs non EP). I see no clear answer in searching the threads.

 

[The Panda Nut]

I dont know, but the older the car the less I suspect it matters and EP 80 or 90 woould probably do the trick. I always reckon a molybdenum additive never hurts these older gears either.

 

[124BC1]

Workshop manuals says SAE 90EP

 

[The Panda Nut]

That sounds about what I would expect. You could ask google for alternatives to EP90 and see what it throws up. Then look at oil company web sites and look at specs to fine your choices?