I just got a 86 chevy blazer with the 2.8 4x4 standard when i bought the truck I was on the road i shifted up to 5th gear and it acted like it didnt want to go faster I was only doing 60 in 5th gear too so is there anyway i can fix this or do any of yall have the same proplems

 

I had an 85 2.8 that did the same thing. Those little motors didn't have much power when they were new. (about 125) Now 25 years and a bunch of miles later, it is probably only putting about 70-75hp to the street...

With mine I just left it in 4th on the highway.

Look in your glove box for the RPO codes, look for a gt4 or a gu6 code. The gt4 is a axle ratio of 3.73:1 and the gu6 is 3.42:1 ...I personally think the 3.42 were too high for the 2.8

Here is a cool link that will explain everything in your truck. Just type in your V.I.N.

Comprehensive GM VIN Decoder

 

Is it slow all together? My 85 was the same way and it was a clogged catylitic converter

 

nope not all together just 5th gear pipes are good just takes a while to get up to speed in 5th

 

maybe its just the gearing itself. those 2.8s aint exactly known for power. i would just get up to 65-70 using 4th then shift into 5th when i wanted to hold my speed

 

Yeah, I think all 2.8's had that problem mine speedometer moves very slow when I hit about 65-70.