Late and early model difference?

[Tanem]

I'm buying some new window felts and need to know if I have an early or late model. Does anyone know how to find out this info and what the difference is between the two? I have a 72 roadrunner.

Thanks for any help!

 

[garbum17]

fran at justmopar.com

 

[moparsteve636]

Depends on the build date!

 

[tommyg29]

Im in for answers too. I have a 11/24/71 build date and cant find them anywhere. Both the inner and outer beltline window seals on mine are starting to go.

Btw, as an aside, I remember the date mine was built very well. Freaked me out when I first figured the date out. I remember because it was the day I scored my only touchdown in pop warner football. We were playing a team visiting from Ohio in our local "Turkey Bowl" LOL

 

[Tanem]

Moparsteve 636- What constitutes the division between early and late?

 

[72RoadrunnerGTX]

Factory Parts books shows a number change for replacement outer door weatherstrips at “approximately Jan 3, 1972”.

 

[mopar 3 B]

Superseded number or was there an actual design change?

 

[Tanem]

Factory Parts books shows a number change for replacement outer door weatherstrips at “approximately Jan 3, 1972”.

Would that make that the line between early and late models you think?

 

[SureGrip]

Maybe for that part, but things like the fuel tank I think are around April of 71.

 

[72RoadrunnerGTX]

The mid-year fuel system changes were April 1 1972, Filler neck, fuel tank, fuel tank vapor separator and related hardware were changed.

A superseded part number is a design change that is backwards compatible, the superseded part can replace the original part/part number. Where a production change is made mid-year, and is listed as different part numbers, before and after a build date, typically are not directly interchangeable for some reason. Not sure would have changed for the outer door cat whiskers, screws vs. clips or screw locations maybe.

 

[mopar 3 B]

The mid-year fuel system changes were April 1 1972, Filler neck, fuel tank, fuel tank vapor separator and related hardware were changed.

That still doesn't explain my 16 gallon fuel tank.

 

[Tanem]

Ok,
here is what I found in regards to window felts and early vs late model 71 and 72.
The easy way to find out is the early model has 6 headliner bows and and late has 4. The reason to know which one you have is because the rear interior window is shorter on the late models. Apparently I have an early model 72 roadrunner.

I dont know if this means all 71 and some 72 are early?

 

[72RoadrunnerGTX]

That still doesn't explain my 16 gallon fuel tank.

Explain please, the April ’72 vapor separator redesign would not have affected the tank capacity. Vent lines were moved to the front of the tank only.

 

[mopar 3 B]

We own two 72 Road Runners, one 400, automatic with 8-3/4 rear and standard 21 gal tank with vapor separator in wheel well. The other 440, 4 spd with Dana and 16 gal tank vapor separator level with top of tank and in front of the tank. I have found top side differences in these cars not near as unusual as what can be seen on the bottom side.

 

[72RoadrunnerGTX]

Strange, have three ’72 2-door B-bodies, 2 before April 1. ’72 and one after, all tanks appear identical, have the same dimensions & capacity, just the vent nipples located differently. Converted one of the older design cars over the later design. The RR/GTX was an 8 ¾, now has a Dana, nowhere near the fuel tank, no factory indication of two deferent fuel tank capacities that I’ve ever seen. Do you have any docs to back up different tank capacities?

 

[mopar 3 B]

À

Strange, have three ’72 2-door B-bodies, 2 before April 1. ’72 and one after, all tanks appear identical, have the same dimensions & capacity, just the vent nipples located differently. Converted one of the older design cars over the later design. The RR/GTX was an 8 ¾, now has a Dana, nowhere near the fuel tank, no factory indication of two deferent fuel tank capacities that I’ve ever seen. Do you have any docs to back up different tank capacities?

Tank is 29" long and 24" wide. I have run it out of fuel more than once and have never gotten 16 gal in the tank. Yea this was a bit puzzling the first time I filled the tank. The build sheet appears not to have anything on it about tank size. Have no idea as what could be furnished for documentation.

 

[NCC1968]

À

Tank is 29" long and 24" wide. I have run it out of fuel more than once and have never gotten 16 gal in the tank. Yea this was a bit puzzling the first time I filled the tank. The build sheet appears not to have anything on it about tank size. Have no idea as what could be furnished for documentation.

When you say "run it out of fuel" do you mean it shut off for lack of fuel..........or you know the tank is actually dry?

 

[mopar 3 B]

When you say "run it out of fuel" do you mean it shut off for lack of fuel..........or you know the tank is actually dry?

Tank was dry. I tried replacing the fuel tank pickup and gauge sending unit in 1979. At that time Chrysler parts acknowledged there being about 100 cars produced with special fuel tanks and the part I was looking for had been made for that run of tanks only and was not available.
Which I had saved that information. At the time other than the part not being available the part number had no relevance.