Doesnt do it all time but if im going 50mph & start up a slight grade the car surges ,the tach bounces from 2500rpm to 3200rpm back&forth.I think its shifting from 5th to 4th back&forth.if I letoff & accelorate quickley it smooths out & the tach drop back to 2500 & runs smooth until the next grade
Visit the on-line store, known as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
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SOURCE: 1998 S70 manual (wont change gear until idle is under 2500rpm)
Being it is a manual transmission and the engine was removed, it is likely the clutch and pressure plate not releasing completely at high rpms.
SOURCE: 1989 volvo not shifting into gear
The only fluid expansion tank I know of is for the cooling system,and if that is the case you my have a leak in the transmission cooler that is built into the radiator.
SOURCE: 1998 Jeep cherokee classic Popping noise
Sounds like your egr valve is sticking, or a vacuum leak, or sticking valves.
SOURCE: my '88 740 wagon won't go into 5th gear
Remove your fuse block cover and look in with a flashlight, towards the passenger side rear you'll see a white tall relay. if you can get your fingers on it pull it out and crack loose the plastic housing, take the housing off and with a fingernail fileboard, clean the contacts between the closing contact. after doing this take a piece of fiberglas tape and tape closed the relay contact. This will leave the car in overdrive mode all the time. Why not, unless you want to pay nearly 110-130 dollars for the relay. The color "might" be black but the last one I did was white. Make sure by looking up the relay legend on the rear of the fuseblock cover.You didn't mention the yellow upwards pointing arrow on the dash while you're driving, that concerns me, although the last one was a 1990 740. Best of luck. P.S. The only reason you would not want overdrive is to pull a trailer up a mountainside and I don't think you want to be doing that with "this" car, right? Good luck my friend.Dana
Testimonial: "My wife had read that this might be a relay problem - I really appreciate the detailed advice on how to rig that, but I might just get another one."
SOURCE: 1996 Volvo 960 has shifting problem.
Check the catalytic converter. You can do this by banging on it and listen for a rattle. Sometimes, the inside gets melted into a little ball and blocks the exhaust from getting out on acceleration. This will cause a serious loss of power and feel like a trans malfunction.
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