spring perch questions

[big_truxx]

I know the 14ff 1ton is different from the 3/4 on the spring perch spacing. Does that mean that the D70 has the same spacing as the 1ton 14ff? Also does the D60 have the same spring perch spacing as any other front end, or is that different too?

 

[smokkey1]

front gm D60 is the same. not sure about the 1 ton D70.

 

[big_truxx]

front gm D60 is the same. not sure about the 1 ton D70.

That's very good info for me Thanks a lot.

Can anyone tell me if the spring perch spacing on the D70 (obviously a one ton dually) is the same as the 14ff ton or are they like 1/2 & 3/4?

 

[big_truxx]

Can anyone tel me if the spring perch spacing on the D70 is like the 14ff ton version or like the 1/2 3/4 tons??

 

[u2slow]

The 1-tons have the same spring spacing (40.5") wether is a 14FF SRW, a 14FF DRW (C&C), or a D70 (DRW pickup).

 

[big_truxx]

Thanks

 

[big_truxx]

Can anybody tell me why the spring perches are different on the one tons? What GM did to make them that way? I am curious to know what's different about the suspension/frame or mounts etc

 

[cyclone]

1 tons, my guess

My guess the reason the 1 ton brackets are closer to the frame is to lessen the leverage created on them by carrying heavy loads, again my guess.
Anyone else? Had wondered this my self when I did my swap.

 

[sweetk30]

to clear the offset of the bigger brakes possibly . the world may neve know???????

 

[big_truxx]

to clear the offset of the bigger brakes possibly . the world may neve know???????

yeah... I agree we may never know. I mean it's only an inch difference IIRC and that'd mean 1/2" on either side... not enough to make any sort of difference in my book

 

[u2slow]

to clear the offset of the bigger brakes possibly . the world may neve know???????

I can't imagine a 1-ton C&C getting away with a wider perch spacing

The other issue is with a 1-ton is the shock placement. It may be a desireable feature for body upfitters to *not* have a shock obstructing a prime mounting location. The outboard shocks on the 1/2 and 3/4-ton should produce a slightly better ride.

The 1-ton SRW brakes still fit on a truck with 3/4-ton spacing.

 

[big_truxx]

Yes that pic shows very well why the spacing is the way it is Guess I can stop wondering now and reweld new spring perches on the D70 when I get my burb project in the next few months