My '85 MGM, "Maisa"

[Lutrova]

My car has a jerk on deceleration. It doesn't happen at all speeds, but if I've got my foot on the gas and then lift it, the car will jerk a bit. It'll also feel a little jerky when slowing to come to a stop.

No idea what's causing it, or if it's the same sort of jerk you're feeling, but I believe the shop manual does have some trans suggestions for this issue. I'll have to look it up when I get home.

[Toploader]

Interesting info, on my '86 MGM 5.0 when on the expressway and I stomp on the gas the entire car shudders as it goes into the "passing" gear.

[Arquemann]

Mine doesn't seem to have any other "symptoms" than the jerky/bumpy decel, and even that isn't anything really worrysome. Like I explained earlier, it feels like misfire, which it just might be.
If I stomp on it at speed and immediately let go, it clunks, but it's only if the throttle goes open and shut quickly. That's most likely just a result quickly loading and unloading the whole powertrain.

[GM_Guy]

Theres lock of mechanical action going on in an AOD. The 35-40ish mph shudder when driving steady speed is due to the mechanical overdrive engaging and disengaging constantly, theres a reason you see a lot of us tell people who buy boxes to drive in D and only shift it into OD when you get to driving at highway speed for more than a couple miles.
Regular driving around, there is the mechanical lock up engaging/disengaging depending on speed and throttle position. It is a clunky trans. Its one of those things that if you don't have a point of reference to a similar transmission it seems all sorts of strange.

[gadget73]

yeah the AOD is a clunky thing. Drive an AODE or 4R70w car sometime and its such a different animal despite the transmissions being very mechanically similar. The difference is the computer controlled shifting vs a massively complex hydraulic valve body that the AOD relies on.

[Arquemann]

yeah the AOD is a clunky thing.

Funny, because my experience with old transmissions only includes my AOD, two clapped out FMXs and a TF A904 with too much stall. And mine's way smoother than any of those.

[sly]

When functioning properly, on stock valve body, they are pretty smooth and tend to burn clutches with the slip between shifts. With a shift kit, this slip is reduced a lot and shifts are firmer which extends rebuild periods well beyond the usual 100-150K miles (all things working normally). But yeah, stock with no shift kit, you shouldn't be able to really feel it working much at all.

[Brown_Muscle]

Highly recommend a shift kit to anyone with an AOD...can set it at the lightest setting and have nice drive-ability and longevity. normally fixes wonky issues too assuming the rest of the tranny is in good shape.

[Arquemann]

Highly recommend a shift kit to anyone with an AOD...can set it at the lightest setting and have nice drive-ability and longevity. normally fixes wonky issues too assuming the rest of the tranny is in good shape.

Hmm, I can surprisingly get a shift kit from Finland. Our go-to us parts store offers a B&M 40263 kit. Is that one any good?
I'm not in a hurry to do one, but considering it's only 79,90€ it might be something I'll do at some point, if having a shift kit is oh-so-nice as you folks say. TBH I quite like how the trans shifts now, smooth as glass when not giving it the beans.

[friskyfrankie]

Hmm, I can surprisingly get a shift kit from Finland. Our go-to us parts store offers a B&M 40263 kit. Is that one any good?
I'm not in a hurry to do one, but considering it's only 79,90€ it might be something I'll do at some point, if having a shift kit is oh-so-nice as you folks say. TBH I quite like how the trans shifts now, smooth as glass when not giving it the beans.

Haven't used any of the major kits but going by friends that have, B&M gets the worst reviews. Transgo gets mixed reviews and Baumann gets the most praise. Here is a link so see what you think?

https://www.becontrols.com/aod.shtml

P.S. They may no longer be selling full shift kits - only valve body improvement kits but you may be able to locate someone that still sells them indirectly. Please see their site for info on that point and what they still sell.

[87GrandMarq]

I have a baumann shift kit in my 87. I like it but it does shift hard so it can be a little scary in the rain. If you can get it in Finland I’d suggest the Shift Technologies Aod shift corrector kit. It fixes all the issues with the stock transmission and will help with longevity. I’ve called them in the past and spoke to a tech in depth, they’re great people and very knowledgeable.

https://www.monstertransmission.com/Superior-Valvebody-Shift-Correction-Kit-AOD_p_5300.html#.YfL8ICROm_Y

Sent from my iPhone using Tapatalk

[gadget73]

Funny, because my experience with old transmissions only includes my AOD, two clapped out FMXs and a TF A904 with too much stall. And mine's way smoother than any of those.

The only 904 I ever drove was an absolute slushbox. That was in an 88 Dakota. never driven an FMX but the AOD is actually based on it.

[friskyfrankie]

My friend has a FMX in his Tempo (which is not quite ready for Talladega) so tough to tell but it seems to be smooth.

[gadget73]

The FMX is a rear wheel drive trans. Definitely not what was in a Tempo. FMX ended production sometime in the later 70s.

unless this is an RWD converted Tempo, in which case we need to know much more about this.

[friskyfrankie]

The FMX is a rear wheel drive trans. Definitely not what was in a Tempo. FMX ended production sometime in the later 70s.

unless this is an RWD converted Tempo, in which case we need to know much more about this.

Sorry - I misspoke. He has a ATX/FLC!