#21  
Old 08-20-2021, 09:36 AM
"QUICK-SILVER" "QUICK-SILVER" is offline
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Quote:
Originally Posted by Steve Barcak View Post
The adaptor/joiner does not appear to mount on anything
Check for numbers on that piece. If it's not 1:1 your speedo will be off without the box.

Not sure, but thinking that 4 speed cars that came with 3.08 rear gears were 1:1 on the cable.

My car came with the box. Orignal owner told me he ordered the car with a lower rear gear than 3.23. What it was is a whole nother story.

Clay

  #22  
Old 08-20-2021, 10:58 AM
Baron Von Zeppelin Baron Von Zeppelin is offline
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If someone has aftermarket dual exhaust - the longer 80" cable might be a better option to give more play-room to route away from exhaust.

The 80" might be better regardless, to make the loop over into the passenger side of tail shaft a less stressful bend.

New cables need to have the cable itself removed from the sheath, and greased with synthetic or moly grease.
Sparingly - but thorough.
Most advise to keep grease away from the last 6 inches at the speedometer end of cable.

  #23  
Old 08-20-2021, 11:07 AM
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Quote:
Originally Posted by "QUICK-SILVER" View Post
Check for numbers on that piece. If it's not 1:1 your speedo will be off without the box.

Not sure, but thinking that 4 speed cars that came with 3.08 rear gears were 1:1 on the cable.

My car came with the box. Orignal owner told me he ordered the car with a lower rear gear than 3.23. What it was is a whole nother story.

Clay
did any 78-79 4 speed t/a's have 3.08s? i always thought that all 78 W72 4 speeds were 3.42, no option on gear ratio when it was a 4 speed, & the auto W72s got 3.23.

my 78 has 3.42 & didnt have the box & 2 piece cable when i bought it, so likely was replaced with the 1 piece long cable. will have to test the speedo with GPS now but it always seemed to be close to accurate when driving in traffic or on the highway with other cars.

  #24  
Old 08-20-2021, 11:55 AM
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Quote:
Originally Posted by "QUICK-SILVER" View Post
Check for numbers on that piece. If it's not 1:1 your speedo will be off without the box.

Not sure, but thinking that 4 speed cars that came with 3.08 rear gears were 1:1 on the cable.

My car came with the box. Orignal owner told me he ordered the car with a lower rear gear than 3.23. What it was is a whole nother story.

Clay
will check it but, it does not have an offset so, guessing it is direct- 1-1.
This TA has 3.42 gear
thanks for the reply

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  #25  
Old 08-20-2021, 11:57 AM
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Quote:
Originally Posted by Baron Von Zeppelin View Post
If someone has aftermarket dual exhaust - the longer 80" cable might be a better option to give more play-room to route away from exhaust.

The 80" might be better regardless, to make the loop over into the passenger side of tail shaft a less stressful bend.

New cables need to have the cable itself removed from the sheath, and greased with synthetic or moly grease.
Sparingly - but thorough.
Most advise to keep grease away from the last 6 inches at the speedometer end of cable.
Thanks for the info'advice. have never done that. I see my closest autozone has one in stock ($12.99) so, I plan to go there today to pick it up and try the fit. My car does have headers with larger exhaust pipe dia and an H pipe. will try the 80"

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  #26  
Old 08-20-2021, 11:59 AM
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Originally Posted by 78w72 View Post
did any 78-79 4 speed t/a's have 3.08s? i always thought that all 78 W72 4 speeds were 3.42, no option on gear ratio when it was a 4 speed, & the auto W72s got 3.23.

my 78 has 3.42 & didnt have the box & 2 piece cable when i bought it, so likely was replaced with the 1 piece long cable. will have to test the speedo with GPS now but it always seemed to be close to accurate when driving in traffic or on the highway with other cars.
not sure on any optional ratios for these cars. I wish the trans had a lower 1st gear, would be easier on the clutch. I think all the 79 400 optioned TA and Forms had 3.23s

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  #27  
Old 08-20-2021, 12:11 PM
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Originally Posted by Steve Barcak View Post
not sure on any optional ratios for these cars. I wish the trans had a lower 1st gear, would be easier on the clutch. I think all the 79 400 optioned TA and Forms had 3.23s
im not 100% sure on the 79's but im pretty positive 3.42 was the only option for W72 4speeds in 78. & ive never heard of 3.08 for pontiac 400s in 78-79 W72 t/a's, but thats not saying they didnt exist.

my car also has headers & bigger exhaust with H pipe, the long 1 piece cable seems to fit & work great. also i have always used a graphite lube for speedo cabless, thought i read or heard back in the day that grease was a bad thing on speed cables??

  #28  
Old 08-20-2021, 12:51 PM
Baron Von Zeppelin Baron Von Zeppelin is offline
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Schools change - randomly
Graphite not the best - most say now its one of the least preferred - along with lithium.
Can't go wrong with a synthetic or moly - sparingly.

A lot of folks install them right out of the box as-is.
Some still use lithium and swear by it
At $13 a pop - you can't get hurt too bad no matter what you do, or don't do.
But one day those will be gone

Grease is only a problem when it dries/hardens/gums inside the sheath after long term (and over-applied).
Lithium and low grades will do that over time.
Especially on a car that sits more than its driven.
Or if it is sloppily applied all the way to the end and works it way inside the speedometer head (bad).

Synthetic and Moly for the long haul

  #29  
Old 08-20-2021, 01:04 PM
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thanks for the info on cable grease... i will try a moly/synthetic grease in the future. my cars & many classics do sit for a long time or get lower miles <1000/year so drying can be an issue.

the graphite was an older thing from the 70s-80s so im sure there are better options today, just need to be sure its the right grease, synthetics werent around back then.

  #30  
Old 08-20-2021, 01:24 PM
Baron Von Zeppelin Baron Von Zeppelin is offline
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With a 270* loop at the Tranny end - i would want something to ease the friction/wear between cable and sheath.

If you have graphite handy and like it - use it.
If you have synthetic or moly on hand - definitely use it.
But would probably rather go dry , than to use lithium or base grease on these fair weather cars that sit so much.

The 79 400 4spd cars were all 3.23 whether A/C or Non A/C
Mine was A/C
I don't know what was being done with the various 77 78 79 cars with various 305 Chevy option / 301 P option , in regard to axles.

  #31  
Old 08-21-2021, 03:54 PM
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Well, good news! Speedo is working and it cost e about $14 with tax at Autozone. they had it in stock. It is a one piece replacement about 80" long. Here are pics and a link.
I thank everyone who participated in this thread and hopes it benefits others too.

Follow Pontiac Heaven on facebook, here is a link- https://www.facebook.com/PontiacHeaven

here is a link to what I bought last night and put in TA this am. https://www.autozone.com/drivetrain/...eVehicle=false
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  #32  
Old 08-21-2021, 04:37 PM
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Incredible they had one in stock at your local Azone
And the price was a double bonus .

Part Numbers for the 80" Cable

Pioneer = CA-3001
ATP = Y-815


funny story -
Pioneer actually offers the lower cable that i can't find for my Van.
But they made it backwards/sideways.
The Female collar at Trans is supposed to be 7/8" - they made it 5/8"
The Male fitting on other end is supposed to be 5/8" - they made it 7/8"
dammit

  #33  
Old 08-27-2021, 08:16 AM
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  #34  
Old 09-28-2021, 04:23 PM
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Quote:
Originally Posted by "QUICK-SILVER" View Post
Check for numbers on that piece. If it's not 1:1 your speedo will be off without the box.

Not sure, but thinking that 4 speed cars that came with 3.08 rear gears were 1:1 on the cable.

My car came with the box. Orignal owner told me he ordered the car with a lower rear gear than 3.23. What it was is a whole nother story.

Clay
I installed a one piece replacement cable from Pioneer. The Speedometer is accurate so, it appears that factory speedo connector is exactly just that, a connector- does not change speedo gearing

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  #35  
Old 09-28-2021, 04:27 PM
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Yes, agreed. It obviously must fit a 'million' GM cars because they would not be stocking it otherwise. O'Reily's has it too for about the same money.
Sadly, I had to replace it again after only a few weeks as I fried the new one as it touched the headers.
So, I have more experience than I need with them.
And - make sure they do not touch the exhaust.
Everything seems harder to do on these TAs over working on my GTOs but, I love them both.






Quote:
Originally Posted by Baron Von Zeppelin View Post
Incredible they had one in stock at your local Azone
And the price was a double bonus .

Part Numbers for the 80" Cable

Pioneer = CA-3001
ATP = Y-815


funny story -
Pioneer actually offers the lower cable that i can't find for my Van.
But they made it backwards/sideways.
The Female collar at Trans is supposed to be 7/8" - they made it 5/8"
The Male fitting on other end is supposed to be 5/8" - they made it 7/8"
dammit

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  #36  
Old 09-28-2021, 06:40 PM
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The F body dash is INFINITELY easier to deal with than a 1969-72 A body dash. I had a 1972 LeMans Sport Conv. and the dash was awful to service.

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  #37  
Old 09-29-2021, 02:52 AM
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Originally Posted by 77 Canamman View Post
The F body dash is INFINITELY easier to deal with than a 1969-72 A body dash. I had a 1972 LeMans Sport Conv. and the dash was awful to service.

Having pulled dozens of each, i will respectfully disagree. Would rather service a 69-72 GTO dash over the firebird any day. So much easier in a lot of ways. Starting with the radio ad moving from there.

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  #38  
Old 10-03-2021, 07:21 AM
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Having pulled dozens of each, i will respectfully disagree. Would rather service a 69-72 GTO dash over the firebird any day. So much easier in a lot of ways. Starting with the radio ad moving from there.
The tach in my '72 LeMans was hell to remove and replace. One of the many reasons it's gone. Not one of Pontiacs better efforts.

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  #39  
Old 11-18-2021, 03:03 PM
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My '79 TA/TA 4spd car had the two piece cable and little gear box connecting them. I replaced it with a one piece cable and the speedo was way off!

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