Master cylinder upgrade--Is this number correct?

[Hubnut]

Upgraded axles and now need 1 ton master cylinder. I searched and can't find a part number. I asked NAPA for a master cyl for a 1989 3500 without hydroboost. He said part number is 39649. Anybody know if this is correct for my 1991 blazer? Are the lines direct hook up? They want $85 for it.

 

[4X4HIGH]

I swapped in 1 ton axles and am still using my stock master with no issues.

 

[toomany]

I swapped in 1 ton axles and am still using my stock master with no issues.

x2

I'm using my stock K5 master cylinder with my 3/4ton stuff.

Wouldn't the 89 K3500 be the new body style? Or did all 1tons stay the old style until 92?

 

[k20]

a k3500 would be the new body style, a v30 would be the old style.