Turbo 400 cooler line fitting Size !!HELP!!

[83ZZ502_Jimmy]

I am retrofitting a turbo 400 into my Jimmy. I need to know what size the cooler fittings are. This is the only thing stopping me from firing it up. It is NPT or what?? Can anyone point me in the right direction?

Many thanks in advance!!
John

'83 GMC Jimmy 4x4 ZZ4 Crate Motor
'83 Chevy P/U 4x4 Sand Drag Racer, 578 RWHP
'94 Impala SS
'01 Chevy 2500HD w/8.1L & Allison Auto

 

[HarryH3]

It's been a lot of years since I installed my Turbo 400, but I think I used brake lines for the cooling lines. Look inside the fittings on the tranny and see if there isn't a slight cone-shaped rise inside. I'm certain that they aren't NPT. They're compression fittings (unless the fittings themselves have been removed from the tranny). It could be that the threads in the housing are NPT, then use an NPT to compression adapter.

<font color=black>HarryH3 - '75 K5</font color=black>
<A target="_blank" HREF=http://www.angelfire.com/super/ThunderTruck>http://www.angelfire.com/super/ThunderTruck</A>
It's a great day to be alive...

 

[83ZZ502_Jimmy]

Does 1/2" 20 sound about right. I got some different sized plugs and it was the one that fit the best.

John

'83 GMC Jimmy 4x4 ZZ4 Crate Motor
'83 Chevy P/U 4x4 Sand Drag Racer, 578 RWHP
'94 Impala SS
'01 Chevy 2500HD w/8.1L & Allison Auto

 

[HarryH3]

Are there any fittings on your tranny right now or just threaded holes in the aluminum case? I'm pretty sure that there should be fittings screwed into the case. Then the cooling lines attach to those fittings. The holes in the tranny may be NPT, but the cooling lines themselves should use flared compression fittings.

<font color=black>HarryH3 - '75 K5</font color=black>
<A target="_blank" HREF=http://www.angelfire.com/super/ThunderTruck>http://www.angelfire.com/super/ThunderTruck</A>
It's a great day to be alive...

 

[83ZZ502_Jimmy]

you got it right. The fittings are in there, I have to screw the flare ends into them.

Thanks,
John


'83 GMC Jimmy 4x4 ZZ4 Crate Motor
'83 Chevy P/U 4x4 Sand Drag Racer, 578 RWHP
'94 Impala SS
'01 Chevy 2500HD w/8.1L & Allison Auto