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#121
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Every now and then, it turns 2800 or so. So, wind, da, inclines will affect the converter slip.
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#122
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A friend's then-girlfriend did that with a Toyota Celica and grenaded the transmission because she was driving in 5th at 30-35 all the time. You've got to have enough "gear speed" inside the tranny to get good oil flow (since its the gears that throw the oil around and lubricate everything). Too high gear at too slow speed will kill a manual tranny every time.
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#123
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Jeff |
#124
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#125
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We actually tried to pull that tranny apart and fix it....after removing C-clip number 5,135,719,654 and not really being much farther along than when we started, we bagged the idea of repair and just got another one. The girlfriend was then "instructed" not to use 5th unless going AT LEAST 50 mph. The owners manual for my ol' Mazda truck said to never use 5th below 45 mph (and now you can say you actually know someone who read their owner's manual). I adhered to that doctrine for the next 21 years, until it blew a head gasket (and possibly cracked the head, too), and decided I was tired of working on it. Ponchy
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#126
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FWIW - the 7.75x14's that came stock on a '65 GTO were 27" tall, not 26.5" tall.
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#127
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Love those old 'yotas. Here's my '84 from this last spring. Only has 158k on the clock. 5th gear is getting noisy. I only ever use it on the freeway. The G52 trannies aren't all that strong though. I have a modified/beefed up W56 waiting for me to find the time to install it. Okay, back to the Pontiyaks!
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---------------------------- '72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car! '73 Firebird 350/4-speed Black on Black, mix & match. |
#128
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That one's on me. Apologies.
Only meant to make a point about driving too slow in too high a gear. ...back on subject...
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#129
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I've never had that be a problem in the bigger GM transmissions like the T56 or the TKO 5 speeds. I've driven those for decades in overdrive at 35 mph and have never had an issue with lube or failures in any of those transmissions. I wouldn't even worry about it.
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#130
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As long as there's enough oil flow to keep everything properly lubricated, then it wouldn't be a problem.
Can only speak from experience, though and those were my experiences. Does seem like kind of a low speed to use an overdrive gear.....of course, if yours aren't, that might be one reason why.
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#131
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The one we currently daily drive has 3.55's with a .64 5th gear. We've cruised around daily through town in 5th gear at 35-ish mph for the last 4-5 years with it. The car is driven everywhere. Never an issue.
Treated all the T56 cars we had previously the same way for decades. I think the examples you guys are talking about are little foreign car transmissions, completely different deal. |
#132
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real hot rods have solid lifters and 4.88’s, buzz your head off at 45 mph and won’t idle below 1500 rpm. what a bunch of sissies! you guys probably have air conditioning and power brakes too, dontcha?
(sneaks off py forum to go look at gear vendors and vintage air web pages ...) |
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#133
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Link to his install of the 4L80E in his GTO: http://forums.maxperformanceinc.com/...d.php?t=823023 Also documented that there is no major sheet metal surgery to install a 4L80E in an A body too, contrary to rumors that are circulated on PY. On some cars a few bumps with a hammer is all that is needed, some cars need no clearancing. Mark documented he needed no tunnel clearancing when doing his swap on his 68 GTO.
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Brad Yost 1973 T/A (SOLD) 2005 GTO 1984 Grand Prix 100% Pontiacs in my driveway!!! What's in your driveway? If you don't take some of the RACETRACK home with you, Ya got cheated Last edited by Sirrotica; 12-15-2020 at 12:37 PM. |
#134
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#135
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Just ordered a 4L80E for another Abody swap coming soon |
#136
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For some strange reason GM cast ears onto the bell housing area on the 4L80E cases used in the truck applications. It may be for the machinery used to build the transmissions at the factory, not sure why they're are there. Those should be trimmed off also before lifting the transmission up into the tunnel for clearancing. No one has ever came out with a reason they're there in the first place, so trimming them off just makes sense to simplify the install. |
#137
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One of the better gear ratio/tire height/mph calculators.
https://weddleindustries.com/gear-calculator
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
#138
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I like how it gives you a lot of info with just a little input. As for me, I know the formula, so all I need is a pocket calculator. speed (mph) x effective gear ratio x 336 / tire height (inches) The result is engine rpm for a given road speed. Run it forwards and backwards. It works. You can have a lot of fun "bench racing" using that formula.
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#139
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I realize the original intent of this discussion is resolved, but I wanted to chime in.
When I daily drove my Firebird (3.55:1), I would just cruise at a speed (on the highway) that I felt comfortable at; If the limit was too high for my liking, I'd just slide over to the right (slow) lane, and if I was concerned about being too slow for the flow of traffic, I'd speed up for a bit, and take a turn off to get onto a secondary highway instead of staying on a major one and being at a speed I didn't care for. Never once did I consider going with less gear.
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
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#140
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For the first 4 years of daily driving the Z I had 3.55's in it with a 27" tire and an M-20 muncie. It was fine, 65 was comfortable and we did a lot of long trips with it that way. The bird has 3.31's and I still use it as my main transportation everywhere, with some long trips mixed in. Doesn't bother me. Most of the time I'm on secondary roads anyway, seldom will I take the highway unless it's necessary. I don't like the highway even if I'm in a car that goes faster, just don't care for it. That's where all the idiots are. |
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