Does the A340F have a pressure adjustment dial? (1 Viewer)
- Thread starter Eicca
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98-02's with the V8
The manual that I have shows A343F.
- Thread starter
- #5
It's not confusing that the 95-97 would have the A343F and the 98-02 would have the A340F or whatever and backwards...
I guess whatever numbers are on there, the question still stands about the 100-series pressure dial.
I guess whatever numbers are on there, the question still stands about the 100-series pressure dial.
Correction: Both 100 and 80 series use the A343F , The A340F was used in the Toyota pickups and Sequoia.
The A343F does have an adjustment (Primary Regulator Valve) on the Valve Body. The effect of adjusting it (to the next higher level) would to be to increase line pressure across the board.
(ignorant) Inquiring minds want to know......what does pressure adjustment mean to us mortals?
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- #9
Firmer/snappier shifting. It's a common mod among racing types. Quicker shifts mean less slipping which means less heat and longer tranny life.
Does the quicker shift put increased (as in shock) load on drive train?
Trunk Monkey
Moderator
Balance your "quicker shifts mean less slipping which means less heat and longer tranny life" against harder shifts and increased fluid heat, decreasing tranny life. Pointless to mess with on these trucks.
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- #12
Depends on how much quicker. If it's an adjustment available from the factory, like a dial on the tranny, it's highly unlikely to cause damage. In the case of the Lexus sedans, the ones in Europe commonly came with the dial cranked up for a sportier feel. Us Americans apparently prefer extra-cushy super-lazy shifting.
Shift kits with full-on valve body mods are more likely to cause extra wear through harder shifts because those far exceed what the adjustment dial can do.
I'm buying a GS400 on Monday and have every intention of turning the dial to max. Reading says it's a noticeable difference but not extreme. I'll probably do it to the Land Cruiser next time it's getting a fluid change.
Hm, seems to me that increased shift response would only be beneficial for on-highway performance use (sports car like shifting). Any benefit to off-road expo use?
- Thread starter
- #14
Definitely. Any high-load situation will benefit from quicker engagements between clutches.
Got it and thanks!
Its possible to go 'too far' with it (I.E. also adjust cable, add washer to PRV) and then have shifts that are too harsh in low range.
But the system is somewhat 'tunable' to accommodate heavier loads, larger tires, worn/fading transmission.
You just need to know what you are doing before making changes.
know what you are doing....unfortunately, in my world (especially with the 100's), not many "pros" know what they are doing (valid for most other professions as well).
Can't tell you how many shops (japanese auto shops, alignment/brake shops, etc.) DON'T know what they are doing even though they claim to.
My "shop that knows what they are doing" test: the basic parking brake adjust. We (on the forum) know this isn't a typical adjust. Well, every shop I visit has failed this test (I then provide the FSM).
Point: look on this forum for recommended mechanics....not many show up, those that do are typically irrelivant in that the info is too dated (trusted mechanic moved on).
That is my rant/rave for today
Can't tell you how many shops (japanese auto shops, alignment/brake shops, etc.) DON'T know what they are doing even though they claim to.
My "shop that knows what they are doing" test: the basic parking brake adjust. We (on the forum) know this isn't a typical adjust. Well, every shop I visit has failed this test (I then provide the FSM).
Point: look on this forum for recommended mechanics....not many show up, those that do are typically irrelivant in that the info is too dated (trusted mechanic moved on).
That is my rant/rave for today
spressomon: Great educational link. Thanks for making me aware of it!
