[1968junkerjim]

I’d like to know what the fitting size is on a 1977 TH 350 transmission looks like 76/77 are different from all the other years looks like maybe 5/16 threads? I ask because I’m putting a 77TH 350 in a 68 Firebird and I need to order lines.

[1968junkerjim]

I will just orders line for a 68 firebird I guess if fittings are different at Tranny I’ll order new ones. just wanted to order everything at one time

[78w72]

Originally Posted by 1968junkerjim

I will just orders line for a 68 firebird I guess if fittings are different at Tranny I’ll order new ones. just wanted to order everything at one time

if you know 76/77 are different size threads than other years, then the 68 lines thread size probably wont be the same, but you probably need the 68 lines to fit the car vs 76/77 that will be shaped different or different lengths.

best to confirm what size the lines are for the 68 radiator & 76/77 transmission. they do make adapters/reducer fittings with different threads if needed.