ClassicOldsmobile.com

TH400 new to me

Tirediron — Thu, 28 May 2026 13:49:38 GMT

I've just finished a 455 motor rebuild and now it's transmission time. The trans came with the motor and I dont know anything about its history. It has no obvious leaks at front or rear seal or pan and that's all I know. And, tho ive rebuilt a few manual trans, I've never been inside an automatic.

Should I just change the oil and bolt it up and hope for the best, or should I do something more?
Like drop the pan and change the filter?
Replace front and rear seals?

Thanks for any advice.

Wheel size question

1arunem — Thu, 28 May 2026 13:33:43 GMT

Found a good deal on some new in the box American Racing Torque Thrust 15x7 wheels, 5x4.75 Bolt circle, 3-3/4" BS with -5mm offset.

Anyone see an issue with running these on a 65 442, stock ride height?

Hurst Dual Gate Shifter 1968 1969 H/O type.

BeenThere — Thu, 28 May 2026 12:20:39 GMT

Vintage Hurst Dual gate shifter. Real Deal, not a cheap foreign repop. This type was offered in the late 1960's. It was used on the 68-69 Hurst Olds cars and the Chevy Yenko cars. The shifter looks like it was barely used, if at all. The mounting brackets have not been bent. It has the correct Daka-Ware shift ****. Overall excellent condition. Includes everything shown in the pictures. $799.00 plus shipping. PM me if interested.

Correct oil drain plug gasket?

72455 — Thu, 28 May 2026 03:15:16 GMT

I'm looking for an oil drain plug gasket for my '72 U code Supreme, and my research landed me on this part number. Is it the right one?

Hello from NW Indiana! 1967 Delta 88 Custom Holiday Coupe

Bombryder — Thu, 28 May 2026 01:47:35 GMT

Hello everyone!

I joined the forum to hopefully learn a thing or two or twenty as I work on my 1967 Delta 88 Custom Holiday Coupe. It was given to me by my wife's grandfather and it has been sitting since around 1986 but likely has not been daily driven since 1973 (the newest registration I could find for it). It has some holes in the rockers, holes in the floor, and the trunk pan is pretty thin too but the body is straight with no previous bodywork I can really see. Shows 70K miles on the Odo which I'm pretty sure is accurate.

I'm not planning on doing a frame off restoration or anything like that but I do want to make it into a "somewhat" reliable driver again that looks good from 20 feet away. Even accomplishing this is going to be a challenge for me!

Anyways, I will probably be asking all sorts of dumb questions about parts crossing between models and such as I get deeper into this due to the fact that any parts that aren't power train related are looking pretty much nonexistent. Thank you in advance for any help I'll probably need in the future!

Clunk when slow backing

Redbud40 — Thu, 28 May 2026 01:44:43 GMT

I recently started hearing a clunk / pop when slowly backing and maneuvering into garage. When going into drive to align better also hear pretty loud pop..
Then again when back to reverse to enter garage. IOW hearing it when going back and forth between reverse and drive to manauever into garage.
Do not hear or feel anything similar driving down the road. ?
Mike

DSS Forged Pistons K2 .030

71Y79 — Wed, 27 May 2026 23:46:55 GMT

Brand new 6000-4155
https://www.summitracing.com/parts/DMS-K2-6000-4155

2618 alloy
Stock 4.25 stroke, 6.735 rod
030 over - 4.155 bore
-12cc dish

$750 shipped

Transmissions

vin442 — Wed, 27 May 2026 22:13:39 GMT

Located in Central NJ - local pickup only - all removed from running cars but being sold as cores as they have been sitting inside for a years

Long tail Turbo 400 65 OA tag

Long tail Turbo 400 75 AA tag

Turbo 700R4 KZ F tag

$150 each

Olds 1971-72 8.5� 10-bolt axle cover Lansing built cover in search of

FLORIDA1972blaze — Wed, 27 May 2026 19:02:43 GMT

looking for a 1971-72 olds 8.5� 10-bolt axle cover with magnet spot welded inside by Lansing fabricator-

64 394ci valve guide woes

Tyroma — Wed, 27 May 2026 15:30:19 GMT

Hey Gang...

Noticed the engine ticking a few days back, and after tracking the sound down with my engine stethoscope, I popped off the driver side manifold.
Well, uh oh...found that the number three piston exhaust valve seal was burned, AND there were metal shavings around the spring. I just installed new valve seals last summer.
I was stumped on figuring out the source of the shavings thinking that the valve guides were bronze. My research yesterday taught me that these engines used steel guides.
Last night, Hudson and I removed the rocker arm shaft and confirmed that there is A LOT of play with the offending valve.

Damn. A screwed valve guide with the Homecoming show around the corner. I have decided not to take the chance with the 4.5h drive to Lansing and risk dropping a valve or seat into the combustion chamber. We are still gonna go, but we will just drive one of our other cars.

I have read that the factory valve guides can be tricky to remove and the is a risk to cracking the head casting. I am going to have the work done by the engine shop. For those of you that know, would I be better to have original style steel guides installed? Or, replace them with bronze guides? If the heads are a the shop anyways, i may as well have hardened seats installed as well. Any wisdom you can impart on my next steps would be appreciated.

Guess I'd better get a parts list sent off to Fusick for pickup at the show!

Oh well, small inconvenience in greater scheme of the hobby.

Tuesday Cruise night

Tyroma — Wed, 27 May 2026 15:04:21 GMT

Hey Gang!

Cruise night season stared a few week back here in SW Ontario. I've managed to get out to a few so far. My boy and I got out to Tillsonburg last night (...yes, the Tillsonburg from the Stompin' Tom song...)
Here's a few Oldsmobiles that we saw.

Cutlass S

Ninety Eight with the supercharged 3.8L mill

VERY clean 442

NOS UHV Ignition Coil 1115248 1967 1968 442 W-30 Hurst Olds

BeenThere — Wed, 27 May 2026 13:30:04 GMT

Vintage NOS GM in the original box. The box top is missing. Delco-Remy ignition coil, part # 1115248. For the 1967 and 1968 Oldsmobile cars with the optional UHV ignition. Also used on the Pontiac GTO from those years. $499.00. Includes U.S. shipping. PM me if interested.

1970 f85 post coupe sheet metal

oldsuniversew30 — Wed, 27 May 2026 11:54:33 GMT

im looking for nos trunk lid or mint used ,nos door skins or mint post doors and 70-71 straight lip mint fenders ,nos headlight bezels ,nos black steering wheel bat wing type or mint used any leads would be grateful pm me if anyone has anything

Delta 88 wont start after powered Windows repair

AMD Geode — Wed, 27 May 2026 10:31:49 GMT

Hi every one.

I bought myself a Oldsmobile Delta 88 from 1989 and i realy like it. But the co driver powered window hat a problem. I could lower the window with the switch but it want come back up. I dismantled the co driver door and testet some wires. After a lot of work i managed to get the window back up but i may shorted something out. The only wires i realy touched where the wires directly on the switch itself. No other wires. I even uploaded a image with a wire diagram and marked the wires i touched with a red circle

.

After i reassembled everything i checked if the powered windows fuse was ok and even testet it with the back windows and everything worked. But since then, the car wont start anymore. I also checked the fuelpump by directly giving it 12V and it runs just fine. Also when i turn on the ignition i can hear the fuelpump for about 2 seconds. So that seems to be working but the car wont start.

It seems like i dont get any sparks on the sparkplugs. And now i wonder if there is maybe a fuse or relay i missed that i may have busted or maybe even smoked the Ignition modul or something elso.

Does anyone have an idea?

371 4v manifold

Putidloyd — Wed, 27 May 2026 06:25:04 GMT

Hey guys and gals, I'm new here. Got a 60 dynamic 88 and can't seem to find a 4bbl manifold for m my 371. Any help would be appreciated