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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: philo_beddoe on December 27, 2015, 06:52:40 am

Title: Where did the tranny fluid go?
Post by: philo_beddoe on December 27, 2015, 06:52:40 am
A few months back i did a tranny kit, and added new fluid of course, and after like 9 qts i finally got a normal reading. Anyway, just happen to check the other day and it looked a quart low! I have never seen one drop of the red stuff on the ground and there is no sign of leakage-like a trail of oil streaks going down the under carriage as if coming out while driving.
Title: Re: Where did the tranny fluid go?
Post by: SkinnyG on December 27, 2015, 08:59:43 am
Theoretically, some can get sucked through a torn modulator and ingested by the engine.

Also, some could get pumped into the radiator via a cracked internal cooler, but I think you'd notice other issues.
Title: Where did the tranny fluid go?
Post by: blazer74 on December 27, 2015, 09:09:44 am
Top it off a roll, keep an eye on it. Check your oil and rad for signs of trans fluid.
If it's a 4x4 it could migrate to the transfer case and eventually overfill.
Title: Re: Where did the tranny fluid go?
Post by: K20Detroit on December 27, 2015, 11:02:32 am
Did you check it under the same conditions? Fluid warm, in park, level ground, after cycling through all the gears?
Title: Re: Where did the tranny fluid go?
Post by: philo_beddoe on December 27, 2015, 12:40:27 pm
i added a quart, will run and switch gears and post results, thanks.


Romans 8:2
Title: Re: Where did the tranny fluid go?
Post by: Captain Swampy on December 28, 2015, 01:45:54 pm
I wouldn't worry unless it needs another quart shortly.
Title: Re: Where did the tranny fluid go?
Post by: werewolfx13 on December 28, 2015, 11:49:37 pm
fluid being drawn through the modulator is a very real possibility. One of the smaller trucks in my dad's tree service "fleet", a 73 f350 dump truck, trashed the valve seals and rings, and transmission, due to this problem over a prolonged period of time. Keep a close eye on it. If the fluid level continues to drop, be sure to check the vacuum line to the modulator for signs of fluid, or replace the modulator outright.