Ferocity02

iTrader: (60)

I bought a Sonnax self-regulating reverse boost valve and installed it and noticed that the inner white spring is loose inside the outer purple spring, it can slide back and forth by about 3/8". I did not notice this when the took the stock valve out. Perhaps it's just because the boost valve is bottomed out in the boost valve sleeve. I just want to make sure I didn't make a dumb mistake.

Also the ATSG manual only shows one spring but mine had two?

Ferocity02

iTrader: (60)

Anyone?

LongIsland63SS409

iTrader: (22)

My 2008 GM factory manual which is the same year as my 4L80E clearly shows two springs in several different diagrams.

The ATSG manual shows only one. They must have made a revision.

What year is your 4L80E?

Mike

Ferocity02

iTrader: (60)

It's a 99.

I think there is free play in the spring because the boost valve is bottomed out in the sleeve. Once there is pressure I suspect the boost valve will move up against the spring. I just wanted to make sure that I didn't assemble it incorrectly.