I’m converting over my rear drum setup to disc and I want to make sure I’m buying the right one. I have an IRS setup. I was told the difference is the E-brake cable length.
Again IRS square tube chassis. I believe its a CMC Build.
Which kit do I buy:
58-67
68-72
or the 73-79
Replies sorted oldest to newest
Without knowing more about your car we can't answer your question.
When you say "square tube chassis" do you mean it is not built on a VW floor pan?
Almost all CMC cars are on a VW floor pan. Almost all rear disc brake kits increase the track moving the wheels out. This limits the wheels you can use.
I chose the AC Industries kit for my CMC because they claim not to increase the track. Even so, they had to mill a little off the face of the hubs so I could use my existing wheels.
What Michael said...
More likely 68-72.
Jeff
not a vw pan full square tube wide body... and I've widened it an additional 2" on each side
Actually 69 in the US is the start of IRS.
1968 had 4 lug wheels, but had long swing axles and a factory camber compensator.
I believe the 1968 long axle has the same spline length as 1969-1972 so the brake fitment is the same.
Danny is correct, with the addition that IRS started in the USA in 1968 on the auto stick cars only. 1969 was the start of IRS on manual transmission type 1.
And is your car a classic body or flared "Calif" body. The California model is more forgiving to a wider stance.
Mine is on a '71 IRS VW pan --- with the stock CMC square tube sub-frame. Here's what that sub-frame looks like --- some think it's a full tube frame.
@WOLFGANG posted:And is your car a classic body or flared "Calif" body. The California model is more forgiving to a wider stance.Flared California body plus I added 2 inches on each side
@LI-Rick posted:Danny is correct, with the addition that IRS started in the USA in 1968 on the auto stick cars only. 1969 was the start of IRS on manual transmission type 1.
I didn't know that, Rick. How many of those were made? And how many are left?
I would think 1968 auto-stick transmissions are about as prevalent as a factory LSD in any Bug trans.
Back in the early 90s, I passed on buying a 1975 911 Sportomatic. I should have bought it, they were rumored to have the clutch tube installed. Just change the pedal cluster, trans, and shifter. Add clutch cable and enjoy.
No pics yet.... as I get closer to completion I’ll post
@WOLFGANG posted:And is your car a classic body or flared "Calif" body. The California model is more forgiving to a wider stance.
Mine is on a '71 IRS VW pan --- with the stock CMC square tube sub-frame. Here's what that sub-frame looks like --- some think it's a full tube frame.
Full square tube “chassis” California wide body. I reworked the the rear flares in the rear to give me an additional 2” on each side.
Is it safe to say I should be looking at the 68/69 - 72 kit ? @WOLFGANG
YES that would be proper fit the IRS. Depending on wheel/tire size and offset even the kits that increase track may fit. I'd stick with zero offset (if backset accommodates) and use spacers to adjust to tire in wheel well appearance. What wheels/tires are you planning to use? You might want to consider 16" or even 17" wheels.
@DannyP posted:I didn't know that, Rick. How many of those were made? And how many are left?
I would think 1968 auto-stick transmissions are about as prevalent as a factory LSD in any Bug trans.
Back in the early 90s, I passed on buying a 1975 911 Sportomatic. I should have bought it, they were rumored to have the clutch tube installed. Just change the pedal cluster, trans, and shifter. Add clutch cable and enjoy.
Good question Danny! The only thing I could find in a quick search is an estimated 10% of type 1’s came with the autostick option. If that is close to true, that means there were about 113,613 in 1968 alone. A majority of those would be in Beetles, a few in Karmann Ghia’s.
I helped a guy convert an autostick to manual many moons ago, I believe it was a 1969, and it had the clutch tube in that pan also. I guess that makes sense, as why build 2 different chassis when 1 will do.
