Built trans question

[AKlowriderZ71]

Does having a built trans increase the likelihood of spinning a water pump pulley or impeller? If so, what is the correlation? It's something that I had never thought about before.

This question stems from a comment I read in Chris' (Thunder550) thread. Someday I will have a built trans, and my GM crate motor came with a stock GM water pump. You see where I'm going with this...

 

[Bonestock]

Hard saying man. My old 02 lb7 ran an everyday tune @548 and had built trans installed @ 150k. The truck now has over 200k and had went thru 1 water pump. The rev limiters on the truck seen well into 4k so its hard saying. I know some people have absolute shit luck with em and others not so much.

 

[Evan@InglewoodTrans]

The transmission has nothing to do with it. It's the fact that people are running more power/RPM and pushing the truck harder after having it built.

 

[Mike L.]

My LB7 ran a big tune from Moonshine for 7 years and no water pump problem.
I don't see how it could affect the water pump.

 

[Chevy1925]

My LB7 ran a big tune from Moonshine for 7 years and no water pump problem.
I don't see how it could affect the water pump.

X2, my truck stayed on the PPE hot+2 lvl7 tune after the trans was built, then went to a 3200uS EFI tune after that and stayed that way till i bent the rods. water pump had 165k on it and was still good. swapped it for peice of mind when i had the motor out and all had been well for 30k of abuse

 

[Bonestock]

The transmission has nothing to do with it. It's the fact that people are running more power/RPM and pushing the truck harder after having it built.

Ya I was just refering to being able to put more power to the ground and turn more rpm. I think that the higher rpm may lead to the impeller problems. But like I said my truck had seen 4000 to 4400 rpm and never had an issue with water pump do to anything other than having high mileage.

 

[thunder550]

The theory that I've heard is that built trans shifts quicker, and the quicker RPM change rate would cause the impeller or gear to spin on the shaft. No idea though. I don't notice the shifts even at WOT. They don't seem any firmer than they did on the stock trans to my uncalibrated butt sensor.

FWIW, I had my built trans done in August, and Mike's guys pointed out a leaky pump. I changed it the following week with a new Bosch pump. That pump lasted 2 months and spun the impeller. No clue if the two are related or I just had shit luck. Either way, I'm kicking myself for not buying a pinned pump.

 

[Mike L.]

Problem with Bosch is they make extremely high end stuff and extremely low end stuff and you don't know which end your getting.

 

[thunder550]

BTW Mike I had a hell of a good time getting that starter out :roflmao: Probably took me an hour, had to pull the motor mount off the engine and the pad off the frame to get it out of there.